The Outdoor Research Ultralight Dry Pack Liners are shaped to fit inside most packs and provide a waterproof barrier for your gear and supplies. The O.R. Dry Pack Liners waterproof and fully taped 40D silnyl fabric keeps moisture at bay, and slides into your pack with ease. A durable buckle makes closing the O.R. Ultralight Dry Liners a snap. The Outdoor Research Ultralight Dry Pack Liners protect everything inside your pack whether you unexpectedly meet deluge or drizzle.