Mardingtop 35L/40L Tactical Backpacks Molle Hiking daypacks for Camping Hiking Military Traveling MATERIAL- 35 Liters. This military backpack is made of 600D polyester. YKK Zipper. HYDRATION COMPARTMENT- This assault pack with hydration compartment and can hold a 2.5 Liter bladder, the tube is fed through the top of the bag near grab handle. MOLLE WEBBING- This rucksack can hang on small items, or for attaching additional pouches or gear. Backpack also has 4 molle hooks underneath to strap a bedroll, tent or anything else. WAIST BELT DESIGN- The waist belt of this bug out bag 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. DURABLE & MULTIFUNCTIONAL- This molle backpack with chest straps to cope with the weight so that it's well used as a 3 day assault pack,bug out bag,survival backpack,army backpack,trekking backpack or day pack. Suits for Hiking,Camping,Trekking,Traveling,School or daily use. With 90 days limited warranty!