Durable Material-35L.This military backpack is made of 600D polyester.Consummate DesignThis tactical rucksack has molle webbing throughout for attaching additional tactical pouches or outdoor gear. The molle backpack also has bottom compression straps for hanging sleeping bag,tripod or tent.Patch area on the top of the camping backpack can be used to paste your favorite badges.Hydration CompartmentThis military army assault pack with hydration compartment and can hold a 2 Liter hydration bladder (hydration bladder is not included), the tube is fed through the top of the bag near grab handle.Waist belt DesignThe waist belt of this military backpack is stitched in, but you can slide them into the middle space behind the back padding support. It's a pretty snuggle fit and won't slide back out on its own.Ideal & Outdoor CompanionThis molle backpack with chest strap is suitable for outdoor activities, school or work,so it's your best choice for 2-day assault pack,camping backpack,motorcycle backpack or hiking daypack.It can even be used for laptop backpack, boy scout backpack or edc backpack.