【New】 This is an AONIJIE soft flask (collapsible running bottle). Material: Made of food-grade TPU (thermoplastic polyurethane), it is safe as it is BPA and PVC free. Features: Equipped with a silicone bite valve, you can easily hydrate while running by squeezing out water. Convenience: The wide opening makes it easy to refill with water. Portability: When not in use, it can be folded and carried compactly.