Outdoor Research 55L Ultralight Dry Pack Liner, Alpenglow, 1Size Ultralight, waterproof 40D silnyl fabric with waterproof taped seams Shaped to fit inside most packs Roll-top waterproof closure with durable buckle secures roll top Dimensions: 28" x 20" x 8"/ 71cm x 51cm x 20cm Volume: 3356 cu in