Built Neoprene 20-Ounce Capacity Bottle Tote, Black Handy insulated bottle tote for bottles up to 20 ounces--great for carrying Sigg, Klean Kanteen, and Nalgene bottles Made of lightweight neoprene, the same material used in wetsuits--no vinyl or PVC used Keeps beverages cold for up to 4 hours (depending on external temperatures) Snap handle attaches to backpacks; stores flat or rolls up for convenient packing and storage Stain resistant; machine wash cold; drip dry