Our Hypernight QuickStart 2.0 4 Liter Hydration Pack gives you the best of both worlds. Equipped with a 1.5L bladder, 2 easily accessible front pockets, and extra storage, you'll be ready to hit the trails for a hike or some walking. Materials: 60% Nylon / 40% Polyester Weight with bladder: 12.38oz / 351g; Weight w/o bladder: 7.23oz / 205g Capacity: 4L – 244 cu in Care Instructions: Hand wash only - Nathan Power Wash Recommended. To clean bladder remove tubing, rinse tubing and bite valve. Turn bladder inside out and rinse dry standing up.