2pcs set: This set has a mesh backpack and a waterproof storage bag ,when the backpack no need to use, it can be foldable in the storage bag, very convinent to storage.When using, the black storage bag can be used as a pencil pouch or cosmetic bag. Lightweight and Durable: Clear mesh backpack is made ofpolyester mesh fabric. The backpack is sturdy and durable, not easy to break or deform, Foldable and light in weight. Mesh Backpack Size: 16.5” x 5.9” x 10.3”. Recommended age: 8 years old and up adults and kids. Backpack with large size main compartments, which is enough to hold heavy school books or stuff for work. Quick & Convenient: The polyester see through mesh shell makes it easy to quickly find the items you need, so you are always ready to take on the day. Multiple occasions: Mesh backpacks are very suitable for various occasions such as schools, airports, beaches, swimming, sports, travel, etc.