This hydration pack bladder is easy one-hand drinking Performs reliably in extreme conditions from -20°C to 50°C (-4°F to 122°F). Platypus Water Bladder UTOBEST UTR210 Hydration Reservoir 3L TPU Water Bladder Water Storage Bag BPA Free For Outdoor Running Cycling Climbing - 18 Bite Valve Cover Insulated Offering great outdoor gears for you. UTOBEST water reservoir keeps water cool for up to 12 hours or warm for 8 hours, ensuring stable temperature in any environment 3-Layer Insulated Material Upgraded Dual-Seal Closure: Leak-Proof double-layer sealing system prevents leaks and heat loss. 3-Layer Insulated Material: Built with TPU–Insulation Cotton–TPU triple-layer construction for superior thermal retention. One-handed operation keeps hydration effortless during runs, hikes, and rides. This 3l hydration bladder is extreme temperature resistance We are young but not afraid of challenges. UTOBEST Hydration Bladder 1.5L 2L 3L TPU Hydration Bladder UTOBEST - Always on the way! Factory Manufacture Food Grade SIlicone Bite Valve In China 360°Rotatable Bite Valve: Flexible, bite-to-drink design enables smooth water flow from any angle.