Gramino Ultralight Waterproof Backpack Liner

The Gramino Ultralight Waterproof Backpack Liner is a 39 g dry bag liner made from 35-micron polyamide, sized at 50 litres to line an entire pack rather than just one compartment. Lining the whole pack means you can use its full volume for waterproofing instead of splitting gear across several separate dry bags, and it doubles as odour-proof storage for food. At 39 g it adds almost nothing to overall pack weight compared with carrying a set of individual dry bags, though a single liner does mean everything inside is protected or exposed together — there's no separating wet from dry gear the way multiple dry bags allow. It suits hikers who want simple, whole-pack waterproofing rather than compartmentalised organisation.