What sleeping bag you actually need for a Nepal trek in 2026

Your bag is your heater

I have guided in Nepal since 1998, and the single thing first-timers get wrong is assuming the teahouse will keep them warm. It will not. Dining rooms have a stove that is lit in the evening and fed with dung or wood, but bedrooms are never heated. The walls are plywood, the windows rarely seal, and the blanket folded on your bed is thin. At Gorak Shep or Lobuche below Everest, or at Deurali and Machhapuchhre on the way to Annapurna Base Camp, the inside of your room drops well below freezing overnight. Once you are in your bag, that bag is the only thing generating and holding your warmth. Sleep badly for three nights in a row at altitude and your appetite, your mood and your ability to acclimatise all fall apart. This is why I treat the sleeping bag as the most important single item most trekkers carry.

What comfort rating do you actually need?

The honest answer is less extreme than most gear-shop staff will tell you, because they are quoting you the limit rating and calling it comfort. For the main teahouse treks in the two normal seasons — roughly March–May and late September–November — a bag rated to a comfort temperature of around -10°C covers you at the highest sleeping altitudes on EBC and ABC. You only need to go colder if you are trekking in the depth of winter, sleeping at a high camp on a peak climb, or you personally sleep cold.

Trek & season	Recommended comfort rating	Down or synthetic	Rent or buy
Low treks under 3,000m (Ghandruk, Nagarkot) — spring/autumn	0 to -5°C	Either; liner + teahouse blanket can be enough	Rent
Poon Hill / Ghorepani — spring/autumn	-5°C	Down (packs small)	Rent
Langtang Valley — spring/autumn	-5 to -10°C	Down	Rent
Everest Base Camp / Annapurna Base Camp — spring/autumn	~-10°C	Down	Rent (buy only if frequent)
Manaslu & Annapurna Circuits (high passes) — spring/autumn	-10 to -15°C	Down	Rent or buy
Any of the above in winter (Dec–Feb)	-15 to -20°C	Down	Buy or rent a premium bag
High camps on a peak climb (Island, Mera)	-20°C or colder	Down, expedition-weight	Buy or specialist rental

Down or synthetic?

For Nepal teahouse trekking I recommend down for almost everyone. Down is warmer for its weight, packs down far smaller in your duffel, and lasts for years. Its one real weakness is that it is useless when wet — but inside a teahouse room you are never rained on, so that weakness rarely bites here. Synthetic bags are bulkier and heavier for the same warmth, but they keep insulating when damp and cost less, which makes them a fair choice if you sleep in tents, expect wet conditions, or are on a tight budget. For a standard autumn or spring teahouse trek, a down bag with a proper comfort rating is the better tool.

Pack a liner — it earns its place

A silk or thermal liner is the cheapest upgrade you can make. It adds roughly five degrees of warmth, so it can turn a -5°C bag into something usable higher up. Just as importantly, it keeps the bag clean — which matters enormously with a rental that dozens of trekkers have used before you. On warm low nights you can even sleep in the liner alone. It weighs almost nothing and folds to the size of a fist. I tell every client to bring one.

Rent or buy — who should do which

This is the question people email me about most, so let me be direct. If you are trekking once, rent. A quality rated down bag rents for roughly US$1–2 a day in the gear shops of Thamel (Kathmandu) and Lakeside (Pokhara) — confirm the current rate locally, as it moves with season and shop — or we simply include one when you trek with us. Renting for a two-week trek costs a fraction of buying, and you do not have to lug a big bag home to a cupboard you will not open again for years.

Buy your own if you trek often, sleep cold, or care about hygiene. Frequent trekkers and mountaineers should own a bag they trust and have tested. If you know you feel the cold, owning lets you pick exactly the comfort rating and fit you need. And some people simply prefer their own bag against their skin — that is a fair reason too. But a good bag is US$200–400, and for a single Himalayan holiday that money is far better spent on the trek itself.

The porter carries it — so weight matters less than you fear

People agonise over the weight and bulk of a warm bag. On a supported teahouse trek you should not. During the day your sleeping bag rides in your duffel, carried by the porter — you walk with only a daypack holding water, a layer, and your camera. So a slightly heavier, warmer bag costs you nothing on the trail. That frees you to choose warmth over grams. The one time weight genuinely matters is a fully independent trek where you carry everything yourself, or a high camp on a peak climb; then down's weight advantage becomes worth paying for.

Staying warm at night: the teahouse tricks

The bag does most of the work, but these habits are what my clients thank me for. Change into clean, dry thermals and dry socks before bed — never the sweaty ones you trekked in, because damp fabric steals your heat all night. Wear a beanie; a lot of warmth escapes from an uncovered head. Ask the kitchen to fill your water bottle with hot water and drop it into the foot of your bag — a Himalayan hot-water bottle that also gives you unfrozen water to drink at dawn. Eat a proper dinner; your body burns fuel to make heat, so a big plate of dal bhat is genuinely warming. And layer the teahouse blanket over the top of your bag for a few extra degrees. Do these and even a modestly rated bag sleeps warm.

The bottom line

For most autumn and spring high treks in Nepal, a down bag with a comfort rating around -10°C plus a liner keeps you warm from Namche to Base Camp. Buy on the comfort figure, ignore the "extreme" marketing, rent rather than buy for a one-off trip, and let the porter carry the extra warmth. Do that and the coldest part of your trek will be the walk to the toilet block, not your bed.

A sleeping bag is just one part of staying warm and packing smart — see our full Nepal trekking packing list for layering and the rest of your kit, our gear rental guide for what to rent versus bring, and the beginner's guide to trekking in Nepal if it's your first trip. Planning a high route? Read the Everest Base Camp trek guide, browse our treks, or contact our team — we're happy to sort your bag out for you.

Featured image: Alex Andrews via Pexels.