VolksRoseÂ® 3L Hydration Water Bladder Reservoir, Non-Toxic Taste Free Insulated Hose and Auto Shut Off Valve to Prevent Leaks for Backpacking, Biking, Hiking and Camping etc.. Materials – Premium Quality TPU material that is resistant to mold and other fungus and bacterials. – Food Grade, BPA-Free, and FDA Approved materials that are extremely resistant to mold and microbes. Bite Valve and Mouthpiece – Durable, reliable, soft, and leak resistant bite valve. – Easy turn ON/OFF valve control to prevent leakage without accessing the bladder in the backpack. Drinking Tube/Bladder connect – 40-inch tube allows for greater use with both hydration packs and hiking packs. – Insulated tube helps maintain water temperature regardless of hot or cold weather. Large Mouth Opening – Easy to use for filling, adding ice, cleaning, and drying. The large mouth opening provides ease for all bladder maintenance. – Fill bladder with water and ice from fridge dispenser without causing a spill or adding ice one-by-one with a small opening. NOTE: When using the Professional Version Bladder, please make sure screwing the hose onto the bladder FIRMLY and TIGHTLY in case of leaking!. VolksRoseÂ® 3L Hydration Water Bladder Reservoir, Non-Toxic Taste Free Insulated Hose and Auto Shut Off Valve to Prevent Leaks for Backpacking, Biking, Hiking and Camping etc.