Hands Free, Hydrate Easily. Your reliable outdoor campanion. Staying hydrated is essential to being alert and limber on the trail, and nothing makes the process easier than a hydration backpack. EVERFUN Hydration Backpack comes with 2-Liter water bladder designed to free your hands, ensure a pleasant journey of mountaineering, cycling, hiking, cross-country running and other scenes. Also, if you like to have a defined space for smaller items, such as kids' stuff/ pet supplies, this EVERFUN Hydration Daypack with a number of interior and exterior pockets would be perfect for you.