DURBLE TPU MATERIAL: Food-Grade TPU material, BPA and PVC Free, the soft water bottle is tasteless and eco-friendly. Flexible soft flask is ideal for marathon, running, cycling, etc CONVENIENT DESIGN: Soft water flask is collapsible and compactly built for a long life for durable use. The running flask stands upright when it full and shrinks in the min volume while empty, no burden for sports EASY TO USE: Silicone bite mouthpiece. Bite the mouthpiece gently to drink water. High-flow bite valve auto-seals after each sip, without leaking. Convenient collapsible water bottle for daily, travel, or outdoor sports RECOMMEND USING: Recommended used temperature: 0 - 40 °C. The folding water bottle with straw/nozzle can be frozen and chilled overnight, easily get a refreshing beverage on a hot day. EASY CARRYING: Ultra-light hand water bottle is easy to fold and carry. It can fit easily in most hydration vest, belt, or pack pockets. Great soft hydration flask for men, women, and kids Specification: br Item:Aonijie Soft flask br Model:SD09/10 br Material:TPU br Capacity:250ml / 500ml br Weight:27g / 33g br Optional: Straws br Features: Folding, lightweight, and BPA free br Application:climbing/hiking/cycling/running br Features: br -Flask compresses as you drink to eliminate water sloshing around inside it br -Updated soft bite valve with higher flow rate, easy on the teeth br -Slim and lightweight, fills easily with wide mouth opening br -Durable Thermoplastic Polyurethane (TPU) construction br -BPA, PVC, and Phthalate free, will not taint taste; Meets or exceeds FDA and EC regulation br - Hydration vest compatible: fits easily in most hydration vest, belt, or pack pockets. Soft material conforms to any pocket for comfortable carrying. br -Reliable and safe: BPA & PVC free. Wide working temperature range (0° C- 40° C / 104-° F) br