20oz/.6L Botttle Included Weight 7.75oz/220g Storage 25 in3/.4L Lightweight mesh material on the holster ? Ultra-wicking Hydrophilic Interlock back panel provides optimal ventilation and Ciba antimicrobial finish helps prevent odors ? 300D Polyester Baby Ripstop ?Nylon Mesh Tight fitting, canted bottle holster ? Strap Secure webbing control ? Reflective piping