LIGHT WEIGHT & COMPACT: Soft bottle collapsible for easy use, storage and transport. SIMPLE: One hand operation with bite valve allows you to stay hydrated on the go, running etc. FUNCTIONAL: Wide mouth design with 2-piece cap comes apart for easy cleaning. RELIABLE: Constructed with TPU (thermoplastic polyurethane) for superior durability and flexibility. GREEN: Ultra-reusable and uses less energy and materials to make, BPA-free.