Hiking, biking or just ambling- if you're an active person that gets thirsty, you'll appreciate our daypack with an included hydration system. Day pack is made with double diamond ripstop polyester. 2 liter hydration reservoir included. Ful adjustable waist belt and sternum strap. Padded and breathable shoulder and waistbelt straps. 8 total pockets. Size: 17.5"X8"X8.5" Color: Black