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Osprey Ultralight Pack Liner — Waterproofing from the inside, which actually works
Better than a rain cover

Waterproofing from the inside, which actually works

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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What you get

  • Works in wind, where a rain cover does not
  • Nothing to blow away or lose
  • Doubles as a wash bag for laundry

What it costs you

  • Slower to get into than an open pack
  • One puncture and it is a bag with a hole
  • Does not protect the pack fabric itself

Do not buy this if: Dry-season Khumbu trekking, where it may never rain on you.

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 dry bags & packing, including the ones we think suit a different trekker.

Sea to Summit Lightweight Dry Sack (set) — Sleeping bag dry, clothes sorted, one bag for the wet thingsBest overall

Sleeping bag dry, clothes sorted, one bag for the wet things

Sea 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.

Skip it ifAnyone on a tight budget. Two heavy-duty bin liners do eighty per cent of this for nothing.