FOLDABLE: This backpack is easy to fold up into its pocket (Not included extra pouch. Just its own inner pocket to pack with. ) Unfold size: 15.5x9x3.5inches. Folded size only 7.5 x 6inches, easily pack it in your suitcase, backpack, or car and simply unfold from your checked bags and use it as a carry-on for your excess baggage to avoid the overweight charge. ENOUGH CAPACITY& LIGHTWEIGHT: One front compartment holds your tissue key or earphone. One main compartment fits your travel essentials: such as clothes and Umbrella. Two side pockets keep your things organized and separated. This lightweight backpack is only 0.56lb, and is easy to carry and use. DURABLE: Made with thickened water-resistant nylon material and high-quality SBS zipper. Durable and not easy to tear. Don't be afraid of getting wet even if it rains when outdoors hiking.