KOSOX&reg; Large 4 Compartment 40L Travel Unisex Water Resistant Ripstop Backpack/ Hiking Daypack /Climbing Backpack Sport Bag Camping Backpack Larger than other packable backpack! 40L! The backpack is made from thicker Water and Tear Resistant Nylon material, provide strengthen and long-lasting performance with minimal weight. It's roomy enough for your hammock, shoes, sleeping bag,clothes,towel, journal,and a couple beers if need be,etc Adjustable and breathable padded shoulder and strap to meet different requirements for both men and women Waist tightening adjustment system and high-quality chest buckle make equipment more professional. The back equip with larger and thicker breathable foam both for added comfort and reduce stress Size: 21 x 13 x 8.66 inches (H x W x D).Capacity: 40 liters.1 Main Compartment, 1 headset Pouch, 1 Zipper auxiliary pouch,1 separate shoe pouch can put shoes or sleeping bag when close the zipper inside the main compartment. 2 Sports Bottle Holder, and Padded Backpack Strap with Chest Clip Ultra-durable, Ultra-awesome daypack.Perfect for hiking,occasional travel,day-to-day use,school,pack beach accessories, suitcase alternative, storing diapers,college, camera compartment, camping and more,and great gift for everyone