TOMSHOO 40L Foldable Packable Backpack Ultra Lightweight Water-resistant Nylon Travel Trekking Bag Outdoor Compact: Folds into zippered pocket to fit anywhere. Unfolds from pocket to a useful backpack Ultra Lightweight: 40L large capacity while only weighing about 15.3oz Durable: Water-resistant and tear-resistant nylon, bearing capacity up to 35kg Comfortable: With padded and soft shoulder straps for optimal comfort Functional: More compartments and pockets keeping your items well organized