450 ml bottle including magnetic-mechanical bottle mounting system for bike frames.The smaller 450ml TWIST bottle with an easy squeeze thanks to a softer material and a new bottle cap with a high flow, self-sealing and leak-proof valve and optional dirt cover. The compact size and simplicity of the 450ml TWIST bottle makes it perfect for kid's bikes, smaller frames or bikes with little clearance from the rear shock.Key Features:450ml VolumeNew leak-proof self-sealing bottle cap with a high waterflow and removable dirt coverBPA-free Polyethylene Fits all TWIST basesDishwasher safe