Our ultra lightweight foldable backpack weight is 0.44 LB,the expansion size is 17.3×11.4×5.1 inch,and the folding size is 4x4x6 inch.Small foldable backpack is an ideal luggage bag for a plane.When it is not used,fold it into a compact pocket (sandwich size).It can be stored in anywhere of coat pockets,luggage,handbags,etc. Our light foldable backpack is water resistance(note:not completely waterproof).We use polyester fabrics and use the latest double-layer wear-resistant process to reinforce the backpack suture.After high-quality materials and light foldable hiking backpacks produced by good craftsmanship,it can effectively protect the items in the backpack. QTY over 1500 are shipped by sea.