Outdoor Research Dry Ditty Sack Set of 3 ditty bags: 1 small, 1 medium, 1 large Durable Barrier fabric; 70D nylon with waterproof coating, waterproof taped seams, two-dimensional flat construction Roll-top waterproof closure, durable buckle secures roll top Dimensions: Small: 5 1/4" x 5 1/2"/13cm x 18cm Med: 8" x 8"/20cm x 20cm Lg: 9 1/4" x 9 1/4"/ 23cm x 23cm Volume: Small: 61 cu in/1L, Med: 153 cu in/2.5L, Lg: 183 cu in/3L