This incredibly lightweight foldable backpack is perfect and useful for any excursion. This foldable backpack travel daypack can fit a lot of stuff inside, very convenient and takes no space, and easy to toss in another bag. Suit for all people. It is waterproof nylon fabric, strong permeability fabric. Capacity:30-40L. Dimension: 11" x 22-1/2" x 7-3/4".