The Black Mountain Products hydration backpack is the ultimate tool for any outdoor adventure! Each pack comes with an extra-large 2-liter water bladder with an easy open cap. Each bladder has a long water hose with a shut off valve on the end. The backpack is designed with adjustable straps and ventilated shoulder straps to reduce sweating and has a big storage pocket to hold items such as food, keys, headphones, tools and more. The backpack is lightweight and perfect for hiking, biking, camping or a walk in the park! BPA Free.