100 percent TPU and Removable Tube: The hydration bladder and tube are made of TPU, 100 percent BPA free and FDA approved, non-toxic and odorless, antibacterial and safe for food use. The tube can be disassembled quickly, which is convenient to carry and store. The surface is wear-resistant and anti-wrinkle, does not cause creases no matter how you bend the pocket and the tube. Large Capacity and design to balance the water level: there is a central baffle which can balance the water level to maintain a slim shape of the bag. Avoid water accumulation in the bottom and inflate your hydration pack, this design saves space and makes it more aesthetic. EASY to WASH: 9CM (3.54") diameter of the inlet of water, large opening is easy to use for filling, adding ice, washing and drying. THERMONEGATIVE HOSE: High quality chloroprene rubber tube can withstand temperature change. two-end interface are anti-slippery and anti-wear, they can be easily disassembled for cleaning, storing. If you have any questions about the product, please feel free to contact us by email, we can answer you and resolve within one business day. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.