• 70L inflatable back pack is made according to military drill requirement.Special air tight zipper and workmanship are used to build the pack. •The bag can be an ideal storage for tent, cotton quilt, anti-moisture mat, water bucket, basin etc. • Close the air tight zipper and pump in air to make it an air right container. Buckling system,waist belt and linking belts can be added to turn it into a swim-crossing device.