Source Tactical ILPS Low Profile Hydration System Upgrade Kit w/Universal Tube Adaptor Innovative low-profile hydration reservoir with 2-liter volume when inserted in vest; up to 3 liters placed inside cargo pack 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