This insulated water bottle from Camelbak features double walled construction that keeps water cold twice as long as regular bottles. It features a 21 oz. liquid capacity and a self-sealing Jet Valve?? so it is always open but it never spills. The bottle is BPA-free, ensuring that your water tastes fresh instead of like plastic. Made of BPA-free plastic. Insulated self-sealing Jet Valve. Double walled construction. Optimized cage fit: Fits a variety of bottle cages. Easy Squeeze: Get more fluid with less effort. Positive lockout for leak-proof transport. 100% free of BPA, BPS and BPF. All parts separate for easy cleaning. Dishwasher safe. Volume: 21 oz.. Imported.