Hydration Bladder Water Reservoir Pack for 3 Liter 3L Backpack System FDA Approved Non Toxic MOST HEALTHY QUALITY- Manufactured anti-bacteria material. Patented GlassAS technology makes it a high smooth interior surface. The smoothness of the liner prevents the germ and the lime from adhension, which promotes health. QUALITY CERTIFICATION-Best water reservoir SGS Verification Military Class Quality, -100% odorless, tasteless, FDA Approved, BPA- Free material. EXCELLENT PATENTED DESIGN-Double bag open design: Capping + sliding opening. Washing and drying are very convenient. Easy to add ice cubes inside. Patented mouth piece and hose fittings: anti-microbial mouth piece, high mobility, automatic locking function to prevent leaks, with a dust cover THE SAFEST DESIGN-Strong elasticity, not damaged. When filled with water, can withstand squeezing. Can withstand the water temperature range: -20 to 50 degree Celsius. 100% SATISFACTION PLEDGE - WITH FREE Cleaning Brush You have our promise that your purchase will meet your expectations. Your purchase is backed by our 100% REFUND PROMISE that if this purchase did not EXCEED your expectations, we will make it right with you starting with a 60-Day 100% Money Back Refund.