The CamelBak Black Mule Backpack with Water Bladder in Classic Style is a versatile hydration backpack made of durable nylon material. This unisex adult backpack features a zip closure and a convenient handle/strap for easy carrying. The black color makes it stylish for summer activities like backpacking, where staying hydrated is essential. With its one-size-fits-all design and reliable brand reputation, the CamelBak Black Mule is a practical and stylish choice for outdoor adventures.