600D, TPU laminated heavy duty waterproof fabric. Welded construction for permanently sealed seams * Non-wicking TPU roll top closure with innovative interlocking profile that is secure and waterproof * Durable UV resistant PVC free fabric withstands cold temperatures. High performance abrasion resistant fabric * Oval base to resist rolling. Features a replaceable buckle with stainless steel pins. Lash loops for secure attachment * Oval Base x Height/Weight: 8-LITER - (8"x 5") x 17", 9.7 oz / 275g. 13-LITER - 9"x 6") x 20", 11.7 oz / 333g. 20-LITER - (11"x 7") x 24", 16.3 oz / 464g. 35-LITER - (13"x 8") x 28", 20.3 oz / 575g. 65-LITER - 14"X10") x 33.5", 28.4 oz / 807g