Seller Warranty - We offer 18 Months Warranty. Please feel free to contact us if the product has any quality issues. , if you have any questions about shipment, exchange or returns, Flexible soft flask is ideal for marathon, running, cycling, etc SPACE SAVING -- Soft water flask is compact and 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 DRINK -- Light squeeze gives ample hydration, high-flow bite valve auto-seals after each sip, without leaking. Convenient collapsible water bottle for daily, travel or outdoor sports PRACTICAL -- The folding water bottle with straw/nozzle can be frozen and chilled overnight, easily get a refreshing beverage on the hot day. ( Recommended used temperature: 0 - 40 ) 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