The WXP Hydration Reservoir has the most innovative, smart, and successful design as it makes filling, cleaning, and draining easier than ever while being 100% leakproof. It comes with a wide-mouth bladder, and a 90-degree design round Helix bite valve with tubing Unique SOURCE Hydration Technologies: Glass Like properties and Grunge Guard prevent dirt build-up and provide purest water taste; virtually self-cleaning and low maintenance; Widepac closure for easy refill BPA FREE BPA FREE Taste-Free System: Our co-extruded PE film retains the pure taste with absolutely no plastic flavor, also over time Drinking Tube: weave covered protecting the drinking tube; QMT quick connector with auto-sealing mechanism allows easy attachment of water filter or UTA Easy Care & Low Maintenance: Simply refill with water and drink again and again without special care. Water will remain fresh for days and even weeks