Osprey Ultralight Pack Liner
Roll-top liner sized to the pack
A rain cover fails the moment wind gets under it or water runs down your back; a liner does not — the cost is that you unpack through a roll-top every time you want anything.
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Do not buy this if: Dry-season Khumbu trekking, where it may never rain on you.
Not every route needs it. These are the ones where our guides would put it on your list.
Everything else we recommend in dry bags & packing, including the ones we think suit a different trekker.
Best overallSea to Summit Lightweight Dry Sack (set)
Colour-coded bags turn a duffel from a heap into something you can find things in at 5 a.m., and they keep your down dry when the duffel spends four hours on a bus roof in rain — they are not submersion-proof, so a river crossing still needs care.
