Outdoor Products Insulated Gel Reservoir, 2-Liter Storage Insulated hydration pack bladder features non-toxic gel lining to keep liquid cool for up to 4 hours V-shaped body allows reservoir to easily slip into any 2-liter hydration pack Includes ergonomic bite valve and quick-release hose attachment and coupler 100% odorless, tasteless, BPA- Free material Backed by a manufacturers 1-year limited warranty