Packing for a Karakoram trek requires careful planning and attention to detail. Unlike more developed trekking regions where you can purchase forgotten items along the route, the remote wilderness of Pakistan’s high altitude trekking areas offers no second chances. Once you leave the small town of Skardu, in the northern Gilgit-Baltistan region of Pakistan, you’re committed to whatever gear you’ve brought for the next two to three weeks.

Whether you’re preparing for the legendary K2 Base Camp trek, the challenging Gondogoro La crossing, or any other glacier expedition in Pakistan’s northern mountains, this comprehensive packing guide ensures you have everything necessary for a safe, comfortable, and successful adventure. Drawing from decades of experience guiding trekking in Pakistan, we’ve refined this list to include only what you truly need, nothing more, nothing less.

Landmarks, glaciers, and high-altitude routes of the Baltoro region at a glance.

The Baltoro Glacier, a 60km snowland that’s the largest glacier outside of the polar regions, and surrounding Karakoram peaks present unique challenges: extreme temperature variations from scorching midday sun to sub-zero nights, sustained glacier walking on unstable terrain, complete wilderness camping for two weeks, and altitudes reaching 5,000+ meters where oxygen is scarce and weather unpredictable1. Your gear must protect you from all these conditions while remaining light enough to carry comfortably.

Before diving into the detailed packing list, understand the weight constraints. Most K2 Base Camp trek Pakistan operators allocate 12-15 kg of porter-carried weight per trekker, plus your daypack which you carry yourself (target 5-7 kg maximum). Exceeding these limits means paying for additional porters or, worse, leaving essential items behind. For complete details about what to expect on the trek, including route information and daily requirements, read our comprehensive guide to K2 Base Camp trek.

Understanding the Layering System

Successful trekking in the Karakoram depends on mastering the clothing layer system. Temperatures can swing 30°C between blazing afternoon sun and freezing pre-dawn camps. You need versatility to regulate body temperature throughout these extremes while trekking, resting, and sleeping.

The three-layer system forms your defense against the elements: base layers wick moisture away from skin, mid layers provide insulation and warmth, and outer layers protect from wind, rain, and snow. Quality gear in each category means comfort; inadequate gear means suffering.

Avoid cotton entirely; it absorbs moisture, dries slowly, and provides no warmth when wet. In the high mountains, “cotton kills” isn’t hyperbole. Choose synthetic fabrics or merino wool for everything touching your skin. Down insulation offers the best warmth-to-weight ratio for jackets and sleeping bags, though synthetic insulation performs better in wet conditions.

Clothing: Base Layers

Tops (3-4 pieces):

Pack a combination of short-sleeve and long-sleeve base layer tops. Merino wool excels for multi-day wear without odor, while high-quality synthetics dry faster and cost less. Bring at least two lightweight tops for active trekking and one or two midweight tops for cold camps and higher elevations.

Brands like Icebreaker, Smartwool, Patagonia Capilene, and Rab offer excellent options. Budget approximately $40-80 per top. You’ll wear each piece multiple times between Askoli and your return, so quality matters more than quantity.

Bottoms (2-3 pieces):

Two pairs of base layer bottoms (trekking underwear) suffice for most trekkers: one lightweight pair for active days, one midweight pair for cold nights and high camps. Consider a third pair if you particularly value fresh clothing or run cold.

Full-length legs provide better protection than short bottoms when sleeping in freezing tents or during unexpected weather. Again, merino wool or quality synthetics only, never cotton.

Underwear (5-6 pairs):

Quick-dry underwear in synthetic or merino blend materials. Six pairs allow rotating through clean options while washing and drying others. ExOfficio, Patagonia, and Smartwool make excellent trekking-specific underwear.

Socks (5-7 pairs):

Your sock system deserves special attention. Blisters can end your trek, and sock choice significantly impacts blister prevention. Use a two-sock system: thin liner socks (synthetic or merino blend) underneath midweight hiking socks (merino wool blend).

Bring 3-4 pairs of liner socks and 4-5 pairs of hiking socks. Include at least one pair of heavy expedition-weight socks for sleeping in cold camps. Brands like Darn Tough, Smartwool, and Bridgedale offer lifetime warranties and exceptional durability.

Fresh socks provide disproportionate morale boosts when you’re tired and cold. Don’t skimp on sock quantity.

Sports Bras (for women, 3-4):

High-impact sports bras that provide good support during long trekking days. Quick-dry materials essential. Consider bringing one extra as a backup since you’ll wear these daily for two weeks.

Clothing: Mid Layers

Layering properly with quality clothing is essential in the stark cold conditions for Karakoram treks.
Layering fleece, insulated vests, and softshell jackets helps retain body heat while allowing flexibility in changing mountain conditions.

Fleece Jacket (1 piece):

A midweight fleece (200-300 weight) serves as your primary insulation during active trekking and cool evenings. Full-zip designs offer better temperature regulation than pullovers. Patagonia R2, Arc’teryx Delta LT, and North Face TKA Glacier are excellent choices.

Budget $80-150 for quality fleece that will last years. This piece gets worn almost daily, so invest in durability and comfort.

Insulated Vest (1 piece, optional but recommended):

A lightweight down or synthetic vest adds versatility for regulating temperature. Wear it over base layers during moderate-cold conditions or under your shell jacket in extreme cold. It packs small and weighs little while providing significant warmth.

Consider brands like Patagonia Down Sweater Vest, Arc’teryx Cerium LT Vest, or Mountain Hardwear Ghost Whisperer Vest ($120-200).

Softshell Jacket (1 piece):

Softshell jackets combine wind resistance, water resistance (not waterproof), and breathability, perfect for active trekking in variable conditions. They’re more comfortable than hardshells during exertion but less protective in heavy precipitation.

Look for stretch fabrics with DWR (durable water repellent) treatment. Arc’teryx Gamma, Outdoor Research Ferrosi, and Patagonia Simul Alpine are excellent options ($150-250).

Trekking Pants (2 pairs):

Two pairs of lightweight, quick-dry trekking pants provide flexibility for the journey. Convertible zip-off pants offer versatility, though full-length pants work perfectly. Look for stretch fabrics that allow unrestricted movement.

Key features: multiple pockets with secure closures, reinforced knees and seat, DWR treatment, and articulated knees. Prana Stretch Zion, Outdoor Research Ferrosi, and Fjällräven Keb are popular choices ($80-180 per pair).

One pair gets worn while the other dries or airs out. Rotating between them extends the time before they desperately need washing.

Lightweight Thermal Pants (1 pair):

A pair of lightweight insulated pants for wearing in camp during cold evenings and for sleeping. These go over your base layer bottoms, providing crucial warmth when you’re not generating body heat through movement.

Patagonia Nano-Air Pants, Arc’teryx Atom LT Pants, or similar ($150-250). These pack small and make the difference between shivering and comfort at high camps.

Clothing: Outer Layers

A waterproof hardshell jacket is essential for protection against rain, snow, and strong winds in the unpredictable Karakoram weather.

Waterproof Hardshell Jacket (1 piece):

Your hardshell jacket is critical emergency protection against rain, snow, and wind. It must be fully waterproof with sealed seams, not just water-resistant. Gore-Tex or similar waterproof-breathable membranes are essential for high altitude trekking where you need both protection and breathability.

Features to prioritize: adjustable hood that fits over a warm hat, pit zips for ventilation, chest-height pockets accessible while wearing a pack, long enough to cover your hips, and durable fabric (3-layer preferred over 2.5-layer for extended expeditions).

Budget $250-500 for quality hardshells from Arc’teryx, Patagonia, Outdoor Research, or Mountain Hardwear. This investment protects you in the mountains for years.

Waterproof Hardshell Pants (1 pair):

Full-zip side-entry rain pants that fit over your trekking pants and boots. These are essential for the K2 Base Camp trek where afternoon storms occasionally dump snow even in summer.

Side zips allow putting them on without removing boots, critical when weather changes suddenly. Look for reinforced insteps and cuffs. Arc’teryx Beta AR, Outdoor Research Helium, or Patagonia Torrentshell ($150-300).

Down Jacket (1 piece):

Your down jacket is your warmth insurance policy. At high camps above 4,000m, temperatures drop well below freezing at night. A quality down jacket rated to -15°C minimum is essential for glacier expeditions in the Karakoram.

Features: 700-800+ fill power down, hood, full-zip front, hand pockets, stuff sack included. Consider water-resistant or hydrophobic down for added protection. This jacket gets worn every evening at camp and during early morning starts.

Patagonia Down Sweater Hoody, Arc’teryx Cerium LT Hoody, Rab Microlight Alpine, or Mountain Hardwear Ghost Whisperer ($200-400). This is arguably your most important clothing item so invest accordingly.

Insulated Expedition Parka (1 piece, optional for high camps):

For extreme cold tolerance or if you tend to run cold, consider bringing a heavier expedition-weight parka for Concordia and K2 Base Camp where temperatures can reach -15°C to -20°C at night during shoulder seasons.

These are bulkier and heavier but provide superior warmth. Mountain Hardwear Absolute Zero, Arc’teryx Ceres, or Rab Expedition ($400-700). Most summer trekkers manage with just the down jacket listed above, but those planning early June or late September treks should seriously consider this addition.

Extremities Protection

Hats, balaclavas, and glove provide essential protection for the head and face in the extreme conditions of Karakoram treks.

Warm Beanie/Wool Hat (1 piece):

A warm hat for cold camps and early morning starts. Merino wool or synthetic fleece. Simple but essential; significant heat loss occurs through your head.

Sun Hat or Cap (1 piece):

Wide-brimmed sun hat or baseball cap for sun protection during trekking. The Karakoram sun at altitude is intense and relentless. Look for UPF 50+ rating, moisture-wicking sweatband, and secure chin strap (wind can be strong).

Outdoor Research Sun Runner Cap, Sunday Afternoons Adventure Hat, or similar ($25-50).

Balaclava or Neck Gaiter (1-2 pieces):

Balaclava provides maximum face and neck protection during cold, windy conditions or dusty trail sections. A lightweight buff or neck gaiter offers versatile sun protection and dust filtering during the day.

Bring both if possible—one lightweight option, one warm option. SmartWool, Buff, and Outdoor Research make excellent choices ($15-40 each).

Gloves – Liner (2 pairs):

Thin liner gloves in merino wool or synthetic for general use during moderate conditions and for wearing inside heavier gloves for added warmth. Having two pairs allows rotation if one gets wet.

Gloves – Midweight (1 pair):

Fleece or softshell gloves with some water resistance for trekking in cool conditions. These get the most use during actual walking. Look for grippy palms and touchscreen-compatible fingertips if you want to use your phone without removing gloves.

Gloves/Mittens – Insulated Waterproof (1 pair):

Heavy insulated gloves or mittens for extreme cold at high camps and during summit day to K2 Base Camp. Mittens provide better warmth; gloves offer better dexterity. Many trekkers bring insulated waterproof gloves that they can layer with liners.

Black Diamond Guide, Outdoor Research Alti, or Mountain Hardwear Absolute Zero ($80-200). Don’t compromise on hand protection; frostbite is a real risk.

Gaiters (1 pair):

Waterproof gaiters keep snow, scree, and debris out of your boots during glacier walking and stream crossings. Full-length gaiters provide maximum protection. Outdoor Research Crocodiles or similar are expedition-proven ($50-80).

Footwear

From steep ascents to rough moraines, proper trekking shoes ensure comfort, traction, and injury prevention on the trail.

Primary Trekking Boots (1 pair):

Your boots are your most important gear investment for the trek to K2 Base Camp. They must provide waterproof protection, excellent ankle support, stiff soles for moraine walking, and comfort for 8-10 hours daily over two weeks.

Key features: full leather or synthetic waterproof construction, Gore-Tex or similar waterproof membrane, Vibram or equivalent technical sole, adequate insulation for cold conditions, and proven comfort through extensive breaking in.

Critical: Break in boots completely before departure. Wear them for at least 50-100 kilometers including multiple long day hikes with your weighted pack. New boots cause blisters; blisters can end your trek.

Recommended models: La Sportiva Nepal Evo GTX, Scarpa Mont Blanc Pro GTX, Asolo Freney XT GV, Salomon Quest 4D GTX ($300-450). Visit a specialty outdoor retailer for proper fitting; this isn’t a purchase to make online without trying first.

Camp Shoes (1 pair):

Lightweight shoes, sandals, or running shoes for wearing in camp during evenings and for crossing streams. Your feet need relief from heavy boots. Crocs, Teva sandals, or lightweight trail runners all work well.

Must be easy on/easy off and comfortable for walking short distances. Budget $30-80.

Sleeping System

Cold temperatures at high altitude make a proper sleeping bag essential for recovery and comfort after long trekking days.
Cold temperatures at high altitude make a proper sleeping bag essential for recovery and comfort after long trekking days.

Sleeping Bag (-15°C to -20°C rated):

Your sleeping bag must keep you warm at temperatures down to -15°C minimum, lower if trekking during shoulder seasons (June or September). Down-filled bags offer the best warmth-to-weight ratio and pack smaller than synthetic bags.

Consider 800-fill or higher down for maximum loft with minimum weight. Women-specific bags account for different body heat distribution and typically provide better warmth for female trekkers.

Water-resistant or hydrophobic down treatments provide extra insurance against moisture. Mummy-shape bags retain heat better than rectangular bags.

Recommended options: Western Mountaineering Alpinlite, Mountain Hardwear Phantom, Rab Neutrino Pro, Sea to Summit Flame (-15°C to -20°C rated, $400-600).

Most tour operators provide sleeping mats, but verify with your operator. For complete details on what’s included in K2 Base Camp treks, see our comprehensive trek guide and our K2 Base Camp Trek page.

Sleeping Bag Liner (1 piece):

A silk or synthetic liner adds 5-10°C warmth while keeping your sleeping bag clean (important for multiday use). It also allows sleeping in just the liner during unexpectedly warm nights at lower camps.

Sea to Summit, Cocoon, or similar ($30-60).

Inflatable Pillow (1 piece, optional):

A small inflatable camping pillow dramatically improves sleep quality. After exhausting trekking days at altitude, good sleep aids recovery. Sea to Summit Aeros, Therm-a-Rest Compressible, or similar ($15-40).

Weight: 100-200g. Worth every gram for the comfort provided.

Trekking Equipment

Trekking poles provide crucial stability and reduce knee strain on steep ascents and descents.

Trekking Poles (2 poles):

Adjustable trekking poles are essential, not optional, for the K2 Base Camp trek Pakistan. They provide stability on uneven glacier terrain, reduce knee strain on descents, help maintain balance during river crossings, and assist on steep ascents.

Features: adjustable length (for varying terrain), comfortable grips with wrist straps, carbide or rubber tips plus snow baskets, collapsible or folding design for packing, shock absorption (optional but nice).

Black Diamond Trail Pro, Leki Makalu, or similar quality brands ($80-200 per pair). If you’ve never used trekking poles, practice extensively before the trek; proper technique matters.

Headlamp (1 primary + extra batteries):

Essential for pre-dawn starts, evening camp activities, and emergencies. LED headlamps with multiple brightness settings and red-light mode for preserving night vision.

Minimum 200 lumens output; 300+ lumens preferred. Rechargeable models work if you bring adequate charging capacity (solar or power banks). Bring extra batteries regardless.

Petzl Actik Core, Black Diamond Spot, Princeton Tec Vizz ($40-80). Bring spare batteries or second headlamp as backup.

Daypack (30-40L):

A comfortable daypack for carrying daily essentials while porters transport your main duffel. Must include hip belt for load transfer, comfortable shoulder straps with padding, multiple compartments for organization, and water bladder compatibility or external bottle pockets.

You’ll carry: 2-3L water, snacks, extra layers, rain gear, camera, sunscreen, first aid kit, and personal items. Target 5-7 kg fully loaded maximum.

Osprey Talon, Gregory Zulu, Deuter Futura, or similar ($100-180).

Duffel Bag (70-90L):

A durable duffel bag for porters to carry your main gear between camps. Must be sturdy enough for rough handling, have lockable zippers, and ideally be water-resistant or include a waterproof liner.

Don’t bring wheeled luggage; wheels add weight and break quickly. Stick to simple, tough duffel designs.

North Face Base Camp Duffel, Patagonia Black Hole, Sea to Summit Duffle ($100-200). Choose 75-90L capacity to fit all your gear with room to spare.

Pack Cover or Dry Bags:

Waterproof protection for your gear. Either a rain cover for your daypack plus waterproof liner for your duffel, or individual dry bags for critical items (sleeping bag, down jacket, electronics, clothing).

Sea to Summit, Osprey, or similar dry bags in various sizes ($15-50 total for several bags).

Water Bottles/Hydration System (2-3L total capacity):

Two 1-liter wide-mouth water bottles (Nalgene or similar) or one 2-3L hydration bladder system plus one bottle. Wide-mouth bottles allow adding hot water for warmth, don’t freeze as easily, and are easier to fill.

Insulated bottle covers prevent freezing in extreme cold. Some trekkers use both bladder (for easy drinking while walking) and bottles (for camp and backup).

Thermos (1 liter, optional):

An insulated thermos for keeping hot tea, coffee, or soup warm during the day. Wonderful luxury for cold mornings and high camps. Stanley Classic Vacuum Bottle or similar ($30-50).

Weight: ~500g. Many trekkers consider this worth carrying for the morale boost of hot drinks.

Personal Items and Hygiene

High-altitude sun protection is essential in the Karakoram—use broad-spectrum sunscreen to prevent severe UV damage on the trail.

Sunscreen (SPF 50+, 2-3 tubes):

UV exposure at altitude combined with glacier reflection creates extreme sunburn risk. Apply generously and frequently to all exposed skin. Bring more than you think necessary.

Look for high-UVA protection (PA++++ or higher) in addition to SPF rating. Zinc-based sunscreens tend to work better at altitude.

Lip Balm with SPF (2-3 tubes):

Lips burn and crack easily at altitude. Apply constantly throughout the day. Bring backups—losing your only lip balm makes for a miserable trek.

Moisturizer:

The Karakoram air is extremely dry. Bring face and hand moisturizer to prevent painful cracking. Small travel sizes suffice.

Toiletries:

Toothbrush and toothpaste, biodegradable soap (Dr. Bronner’s or similar), small quick-dry towel, wet wipes (essential for hygiene when water is scarce), hand sanitizer (large bottle), deodorant (optional—everyone smells by week two), razor (optional), feminine hygiene products as needed.

Pack everything in ziplock bags to prevent leaks.

Toilet Paper and Ziplock Bags:

Bring your own toilet paper and large ziplock bags for packing out used paper (Leave No Trace principles). Portable toilet paper in travel-sized rolls works perfectly.

Prescription Medications:

Bring sufficient quantities for the entire trek plus several extra days’ supply in case of delays. Carry medications in original containers with clear labels. Bring copies of prescriptions.

Common medications to consider2 (consult your doctor):

  • Diamox (acetazolamide) for altitude sickness prevention
  • Pain relievers (ibuprofen, acetaminophen)
  • Anti-diarrheal (loperamide)
  • Antibiotics (broad-spectrum, prescribed by doctor)
  • Altitude sickness emergency medications (dexamethasone, nifedipine—prescription only)

Personal First Aid Kit:

Blister treatment (Compeed, moleskin, athletic tape), bandages and gauze, antiseptic wipes, antibiotic ointment, tweezers, scissors, safety pins, and any personal medical items.

Your tour operator provides a comprehensive group first aid kit, but personal basics are essential.

Electronics and Documentation

Camera and Extra Batteries (3-4 minimum):

The Karakoram offers once-in-a-lifetime photographic opportunities. Bring adequate camera equipment and spare batteries; cold temperatures drain batteries rapidly.

Keep batteries warm in inside pockets and sleep with them in your sleeping bag to maintain charge. Bring more batteries than you think necessary.

Phone:

Your phone serves as camera backup, emergency communication (though coverage is minimal beyond Askoli), GPS with downloaded offline maps, and entertainment (load books, podcasts, music).

Download offline maps of the trek route before departure. Apps like Maps.me or Gaia GPS work without cell service.

Portable Solar Charger or Power Banks (20,000+ mAh capacity):

Multiple high-capacity power banks charged fully in Skardu before departure. Solar panels help but are weather-dependent. Bring adequate battery capacity to last the entire trek.

Anker, Goal Zero, or RAVPower (20,000-26,000 mAh, $50-100 each). Bring 2-3 power banks for full peace of mind.

Manage power carefully; this is all you’ll have for two weeks.

Charging Cables:

All necessary cables for your devices. Bring backups for critical items like phone charging cables.

Passport and Copies:

Original passport (required for permits and hotels) plus 2-3 photocopies stored separately. Bring digital copies on phone and cloud storage.

Trekking Permit Copies:

Your tour operator handles permits, but carry copies of all permits and documentation during the trek.

Travel Insurance Documents:

Physical and digital copies of insurance policy, emergency contact numbers, and claim procedures. Essential for emergency evacuations.

Emergency Contact Information:

List of emergency contacts back home, embassy numbers, tour operator contact details, and insurance emergency assistance numbers.

Cash (USD and Pakistani Rupees):

Bring cash for tips (budget $200-300 USD for porter and guide tips), personal expenses in Skardu, and emergency situations. Small denominations work best for tipping.

Optional but Recommended Items

Book or E-Reader:

Entertainment for weather days, rest days, or evenings. Physical books add weight; e-readers are lighter but need charging.

Journal and Pen:

Recording your adventure travel Pakistan experience makes powerful memories. Small waterproof notebook and reliable pen (avoid ballpoint which freeze at altitude—space pens work better).

Playing Cards or Small Games:

For socializing with trek mates during downtime.

Antibacterial Towel:

Quick-dry camping towel for basic washing. PackTowl or similar ($15-30).

Trekking Umbrella:

Surprisingly useful for sun protection during walking and rain protection without overheating. Lightweight trekking umbrellas (EuroSchirm, Gossamer Gear) are designed for hiking.

Duct Tape (small roll):

Universal repair tool. Wrap some around your trekking poles to save space.

Ziplock Bags (various sizes):

For organization, waterproofing, trash collection, and a thousand other uses.

Small Locks:

For securing duffel bag zippers and hotel room doors.

Stuff Sacks:

For organizing gear within your duffel and daypack.

What NOT to Bring

Heavy or Unnecessary Items:

Avoid bringing: multiple pairs of jeans or cotton clothing, excessive clothing changes (you’ll smell anyway), laptop computer, hair dryer, full-size towels, heavy books, excess electronics, valuable jewelry, more than one week’s worth of anything you’ll use daily.

Every kilogram matters when porters carry your gear for two weeks. Be ruthless in editing your packing list.

Packing Strategy

Weight Distribution:

In your duffel (porter-carried): sleeping bag, clothing you’re not wearing, camp shoes, toiletries, extra layers, electronics for charging.

In your daypack (you carry): water, snacks, rain gear, extra warm layer, first aid kit, camera, sunscreen, daily essentials.

Organization:

Use stuff sacks or packing cubes to organize by category: sleeping system, camp clothing, trekking clothing, toiletries, electronics. This makes finding items in your tent much easier.

Accessibility:

Pack items you’ll need first on top. Sleeping bag and clothes for that night’s camp should be easily accessible when duffel arrives at camp.

Waterproofing:

Line your duffel with a large trash bag or use dry bags for critical items (sleeping bag, down jacket, clean clothes, electronics). Rain and stream crossings happen.

Pre-Trek Checklist

Before leaving for Pakistan:

  • Break in boots completely (minimum 50-100 km)
  • Test all gear on training hikes
  • Charge all power banks fully
  • Download offline maps
  • Make copies of passport and documents
  • Verify insurance coverage
  • Pack and weigh duffel (stay under 15kg)
  • Test daypack fully loaded
  • Load e-reader with books
  • Prepare tip money (small USD bills)
  • Review trek route and expectations

For complete preparation beyond just packing, including training, permits, costs, and what to expect on the K2 Base Camp trek, read our comprehensive K2 Base Camp trek guide.

Download Your Printable Checklist

Download the Complete Karakoram Treks Packing Checklist PDF: A printable, checkbox-format version of this complete packing list that you can use while preparing for your trek. Print it out and check off items as you pack them!

Ready to Trek?

With proper gear carefully selected and packed, you’re prepared for the physical challenges of trekking in the Karakoram. The right equipment keeps you safe, comfortable, and able to fully enjoy one of the world’s greatest mountain adventures.

When you’re ready to experience the K2 Base Camp trek with expert local guides who provide comprehensive logistics and safety support, Karakoram Treks delivers the professional expedition services you need for this life-changing journey to the foot of the world’s most formidable mountain.

Questions about gear or preparing for your Karakoram trek? Contact our expedition experts for personalized advice.

References

  1. Bishop, Michael P., et al. “Climate change and mountain topographic evolution in the central Karakoram, Pakistan.” Annals of the Association of American Geographers 100.4 (2010): 772-793. ↩︎
  2. https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html ↩︎