Your gear will not break in Nepal, it will quietly stop working above 4,000 metres

Eight seasons carrying other people’s bags taught me one thing about gear, and it is not the thing the shops tell you. Kit almost never breaks. It quietly stops doing its job, somewhere above 4,000 metres, and the person carrying it assumes they did something wrong.

They did not. The cold, the thin air and the dryness simply took away the conditions the thing needed to work. A stove that will not light, a power bank reading empty at dawn, a down jacket that has gone flat by day six — none of those is a broken object. They are all the same story told three ways.

I grew up in Syabrubesi, at the Langtang road-head, and started portering at seventeen. That is most of my qualification here. I have hauled the expensive duffel that fell apart and the cheap one that did not, and I have watched a lot of brand-new kit come back down worn twice.

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Four things go wrong, and always in the same order

Everything in this article is one of four forces. Cold takes your gas pressure and your battery capacity. Thin air makes fuel vaporise badly and stops anything drying. Dryness works on skin, lips and glue. Ultraviolet climbs about 12% for every 1,000m, per the World Health Organization — so at Base Camp you are standing under roughly 60% more of it than at sea level.

None of it is dramatic, and that is the whole problem. It is gradual enough to feel like your fault.

The stove goes first, and it is not close

If you carry your own stove, this fails before anything else. A canister works because the liquid inside boils into gas. Straight n-butane boils at −0.5°C. Isobutane at about −12°C. Propane at −42°C. Below its boiling point the liquid will not vaporise fast enough to hold pressure, and your flame goes to nothing.

Gorak Shep in November runs −15°C to −20°C at night. A plain butane canister is not struggling up there, it is dead. Even a decent 80/20 isobutane–propane blend loses about 38% of its vapour pressure at −5°C against 0°C, going by the manufacturer’s own figures at Cascade Designs. Altitude piles on: butane’s vaporisation already falls away above about 2,100m.

Honestly though — do not bring one. Every lodge on the Everest and Annapurna trails cooks, and sells boiled water. Carrying a stove up the Khumbu to save on tea is a lot of weight to prove a point.

Your power bank is not dead, it is cold

Lithium-ion loses real capacity in the cold. Published work puts it at roughly 20–30% of rated capacity, with the steep drop below about −10°C. So the bank that reads empty at 6am and half full by lunchtime has not failed. It was never empty. It was holding a third less than the number on the side, and it hands that back as the day warms.

The fix is free. Sleep with the power bank, your phone and any spare cells inside the sleeping bag. Not in the tent, not in the pack — in the bag, against you. That one habit solves most of what people mistake for broken electronics on this trek.

It is also why a rechargeable headlamp core beats disposable cells up there. You can warm it and top it up.

Do not buy a down jacket for one trek

Here is the unprofitable bit, early, where it belongs.

Down works by trapping air in its loft. Damp flattens that loft, and above 4,000m nothing dries — the air is cold, the pressure is low, and the moisture coming off you each night stays in the jacket. By day six a jacket that felt enormous in the shop is visibly thinner.

Rent it. A couple of dollars a day in Thamel or Pokhara, wear it for a fortnight, hand it back. The rental racks carry exactly the right jacket for exactly the right length of time, and I have seen enough $400 jackets come off the trail and go into a wardrobe forever to be quite firm about this.

Same for the sleeping bag. A four-season bag is bulky, expensive and no use to you at home. The one people get wrong in the other direction is buying a −30°C bag for a trek that tops out in a heated lodge — that is a lot of money and volume for a night you will never have.

If you want one thing of your own in that system, make it a liner. Light, adds genuine warmth, and keeps a rented bag clean.

Boots fail at the join, not the upper

Uppers almost never give way. Soles come apart, because the adhesive holding midsole to outsole is what dislikes cold, dryness and being flexed over rock all day. The classic is a good pair that has sat in a cupboard for three years — the glue has aged quietly, and the trail finds it on the descent.

The other half is fit, and it is the one that gets people. Feet swell at altitude and over long days going down. Boots that fit beautifully in a shop at home are half a size too small on day nine off Kala Patthar. That is where the black toenails come from. Buy with room, and walk them properly before you fly — blisters are the single most common thing I have watched ruin someone’s week, and they are entirely preventable.

Socks are the cheapest thing that actually works

Socks are the one item worth real money and the one nobody budgets for. Two or three pairs of merino, rinsed in a bucket, beat six pairs of cotton, because merino keeps insulating while damp and cotton does the exact opposite against your skin.

It is a sixty-dollar decision protecting an $1,850 trek. Buy the good ones. It is fine, this is the one place to spend.

One frozen night ruins a water filter

Hollow-fibre filters — the type in nearly every squeeze and bottle filter — are destroyed by freezing. The fibres crack, the filter still looks completely fine, and it now passes precisely what you bought it to remove. There is no way to see it and no way to test it on the trail.

Above 4,000m either the filter sleeps in your bag with the batteries, or you carry chemical treatment instead. Chlorine dioxide drops weigh nothing and cannot freeze-fail. What we actually recommend is on the water treatment page.

Buy it, rent it, or leave it at home

In plain words, because it is the whole article: rent the down jacket, the sleeping bag, the poles and the duffel. Buy the boots, the socks, the headlamp and the sun protection. Leave the stove at home.

What I actually watch go wrong

Never the exotic failures. It is a three-year-old boot letting go on the descent, a power bank that reads empty at dawn, and a bag rated for a cold nobody on that itinerary will ever meet. Three problems, none of them solved by spending more money, and all three sorted before you leave home.

There is a fourth I keep seeing, and it is not gear at all. People insure the trip and forget the altitude. Most standard travel policies stop covering you somewhere between 3,000m and 4,000m, which is under every pass on this list. Check the number written in your policy against the number on your itinerary — the Nepal trekking insurance guide covers how.

The verdict

Buy the four things that touch your body and have to fit — boots, socks, headlamp, sun protection. Rent the four bulky things that only matter for a fortnight. Sleep with anything that holds a charge. Assume nothing dries above 4,000m and pack a system that still works wet.

Do that and gear stops being something you think about, which is the point of all of it. The list is short because it should be.

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Featured image: Sherine via Pexels.