20L Large Capacity Waterproof Foldable Bike Backpacks Ultralight Travel Bag Outdoor Hiking BackpackFeature:1. Portable: The ultra lightweight backpack can be folded into an inside pocket and can be stored anywhere, space-saving, lightweight and easy to carry.2. Waterproof & Durable: The lightweight folding backpack is made of waterproof and tear-resistant nylon. It is durable and uses a two-way waterproof zipper to effectively protect your items from getting wet. Fastening mode: zipper, fastening.3. Multifunctional: The ultra-light backpacks are very suitable for daily short trips, school, hiking, sports, camping and shopping, to provide enough space for people of different ages, it can also be used as small gifts for family and friends.4. Unique Design: Small backpack breathable mesh straps and sponge pads for men and women can help you reduce the pressure on your shoulder, the length of the shoulder straps can be adjusted, the sentinel button chest straps will help you secure your backpack.5. Large Capacity: With 1 main bag, 1 front bag and 2 mesh side bags, the spacious foldable travel backpack can easily store all items, and the main bag can store clothes and all kinds of equipment. The second pocket is very suitable for quick access to cash, credit cards, passports and other items, and the two