The Outdoor Research Ultralight Dry Sacks reduces sleeping bags and other stuffables to a pack-friendly size. The O.R. Ultralight Dry Sacks waterproof and fully taped 40D silnyl fabric keeps moisture at bay and slides into your pack with ease. A durable buckle closure seals the O.R. Ultralight Dry Sacks with ease. The Outdoor Research Ultra Light Dry Sacks will reduce the size of gear and goodies for a lightweight waterproof carry.