Material: TPU 2L LARGE CAPACITY HYDRATION BLADDER:The 2L hydration bladder is designed for most hydration pack sizes. You can use the backpack hydration bladder for outdoor activities: hiking, running, cycling, skiing, horse riding, camping, cycling, climbing, etc. It's a must-have for sports fans and an ideal gift choice. Waterproof backpack for sport cycling. LARGE OPENING FOR FILLING AND EASY TO DRINK:The drinking water reservoir of the 2L hydration bladder has a large opening through which the water can be easily filled / refilled and cleaned. This 2 liter water tank can withstand temperatures from -20 to 50 degrees Celsius. The TPU tube has excellent elasticity, is more resistant to bending, and is easier to adjust while drinking. ANTI-LEAK AND ERGONIMAL HYDRATION VALVE:Military grade sealing lines are attached to the edge of the military grade hydration bladder to ensure that the 2L bladder is pressure tolerant and leak proof. The bite valve has an ON / OFF switch. Just bite the mouthpiece to suck in water. The dust cap protects the mouthpiece from dirt. Simply pull the bite valve up to drink and push to close. Size:Specifications: 36.5CM x 18CM (L x W), Tube length 100CM, Thickness of water bag: 0.28-0.3MM Package List: 1 x Water Bag