Highly versatile drinking system. Made from transparent, mold-resistant, odor- neutral polyurethane. Reservoir features wide opening for easy filling and cleaning. Secure slide fastener stays tightly sealed even under considerable strain. Tube plugs straight into reservoir; outflow valve only allows liquid out with tube connected (so no risk of splashing when connecting the tube). Angled push/pull mouthpiece can be opened with teeth. Mouthpiece features a silicon easy-flow tip; when the mouthpiece is in the open position, riders can start the flow of liquid simply by biting gently on the mouthpiece. Capacity: 2 liters / 0. 5 gallon.