Outdoor Research Airpurge Dry Comprssn Sack 25L, Black, 1Size Air permeable/waterproof fabric band purges air during compression with four compression straps Hydroseal coated Antron nylon is waterproof and durable, waterproof taped seams, roll-top waterproof closure, durable buckle secures roll top. Internal zippered pocket doubles as small item and stuff sack storage External daisy chain and webbing bottom handle Dimensions - Rolled: 25.5" x 9"/ 65cm x 23cm, Volume: 1526 cu. in