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Travel Himalaya Nepal
Sea to Summit Reactor Thermolite Liner — Hygiene, plus about 8 °C of extra warmth
Buy this even if you rent

Hygiene, plus about 8 °C of extra warmth

Sea to Summit Reactor Thermolite Liner

Thermolite, adds roughly 8 °C, ~250 g

The one sleep item everyone should own: it solves the rented-bag hygiene question and turns a borderline bag into a warm one — the warmth claim is optimistic, so treat 8 °C as nearer 5 °C in practice.

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What you get

  • Makes a rented bag genuinely pleasant to get into
  • Real added warmth on the two coldest nights
  • Washable in a lodge sink

What it costs you

  • Manufacturer warmth ratings are generous
  • Twists around you if you turn a lot
  • Not cheap for what it is

Do not buy this if: Nobody who is renting a bag. This is the item that makes renting work.

Treks we recommend this for

Not every route needs it. These are the ones where our guides would put it on your list.

The alternatives

Everything else we recommend in sleeping bags, including the ones we think suit a different trekker.

Down-filled, rated around −15 °C, with a linerWhat most people should do

The single biggest money-saver on a two-week trek

Four-season down bag (−15 °C), rented

A bag you would buy costs several hundred dollars and you need it for perhaps five cold nights. Kathmandu and Pokhara rent good ones for a couple of dollars a day, and we make nothing from telling you that — take your own silk liner and the hygiene question answers itself.

Rental shops in Kathmandu and Pokhara carry this — about usd 1-2 per day in thamel or pokhara lakeside. We take nothing from that.