Source Outdoor Ultimate Hydration System with Widepac Reservoir Hydration reservoir with wide opening for easy filling, cleaning, draining, and ice insertion; 3-liter capacity (100 ounces) Taste-free bladder with maintenance-free Glass Like liner prevents bio-film build-up Universal Tube Adapter fits variety of water bottles and indoor/outdoor taps and faucets for fast refills Rounded Helix bite valve delivers a full flow with just a soft bite; built-in safety shutoff mechanism Magnetized drink tube holder secures hydration hoses in place