I underestimated altitude once, properly underestimated it, packed like I was going on a normal cold-weather trip and ended up breathless walking up a single flight of stairs while pretending to my own camera that I was fine. High altitude packing isn’t just “pack colder,” it changes how your body copes with everything, and high altitude packing needs more thought than a standard mountain trip. Here’s the high altitude packing guide I wish someone had given me before that particular ego check.
High altitude packing starts with thinner air
The biggest high altitude mistake isn’t a packing one at all, it’s assuming fitness at sea level translates directly up there. It doesn’t, and no amount of good gear fixes that on its own, but the right kit makes a real difference to how much you actually enjoy it instead of just surviving it.
- Proper insulating layers: altitude temperature swings are extreme, warm sun in the day, sharp cold the second it drops or clouds roll in
- A windproof outer shell: wind at altitude cuts through normal jackets in a way it doesn’t lower down
- Moisture-wicking base layers: you’ll still sweat from exertion even in the cold, and damp base layers at altitude get cold fast
High altitude packing goes wrong at the footwear
Regular trainers don’t cut it once you’re on uneven, rocky, or icy terrain at altitude. Proper hiking boots with ankle support and real grip matter more here than almost anywhere else on this list, a twisted ankle a long way from help is a much bigger problem at altitude than it would be anywhere else. Break boots in before you go, always, blisters on a multi-day trek are miserable in a way that’s hard to overstate.
The small stuff that makes the biggest difference
These are the things I forgot on my first proper high altitude trip and now never travel without:
- SPF, genuinely high factor, UV exposure increases significantly the higher you go and it catches people out
- Sunglasses with real UV protection, glare off snow or bright thin air is more intense than it looks
- A headtorch, for early starts or if a day runs later than planned
- Electrolyte tablets or sachets, altitude dehydrates you faster than you’d expect
- Painkillers for altitude headaches, common enough that it’s worth just having them on hand
- A buff or neck gaiter, doubles as sun protection and as a barrier against sharp wind
What to actually wear, not just pack
Altitude light does something incredible to photos, that sharp clarity you only get once you’re properly up high, so it’s worth dressing in a way that holds up against big open landscapes rather than getting lost in them. I keep a base of practical, technical layers in neutral tones, then bring one brighter outer layer that stands out against snow, rock, or sky. Function first out here, but it still photographs properly if you pick the right one bright piece.
A realistic high altitude packing list
- 2-3 moisture-wicking base layers
- 1-2 insulating mid layers (fleece or down)
- 1 windproof, waterproof outer shell
- Proper broken-in hiking boots
- Wool hiking socks (several pairs)
- Warm hat + sun hat
- Sunglasses with UV protection
- High-factor SPF
- Headtorch
- Electrolyte tablets/sachets
- Buff or neck gaiter
- Basic altitude headache painkillers
The honest bit
No packing list survives contact with an actual trip. You will still misjudge how hard thin air hits you at least once, everyone does the first time. The goal isn’t a perfect suitcase, it’s not standing at altitude gasping for breath in a jacket built for a normal cold day, wondering why nothing feels like it’s working the way it should. Layer properly, protect against sun and wind, respect the altitude itself, and let the rest sort itself out.
Where this high altitude packing list actually gets used
Altitude is the deciding factor in a lot of the world’s best trekking. The country guides for Nepal, Peru, Bolivia, Ecuador, Kyrgyzstan and Tajikistan cover the seasons and the heights involved. Altitude sickness is not about fitness, so read the NHS guidance on altitude sickness before you go anywhere high.