Source Tactical WXP 3L Low Profile Hydration System Upgrade Kit w/ Universal Tube Adaptor, Coyote High-performance hydration reservoir with wide opening for easy filling, cleaning, draining, and ice insertion; 3-liter capacity (100 ounces) Universal Tube Adapter (UTA) fits a variety of water bottles and indoor/outdoor taps and faucets Taste-free reservoir with maintenance-free Glass Like liner prevents bio-film build-up Patented non-bite Storm push-pull valve for straw-like drinking Drinking tube with Cool Weave cover blocks UV light and insulates; compatible with QMT accessories