DURABLE MATERIAL AND LIGHTWEIGHT- The see-through swim backpack is made of heavy duty polyester mesh, which can withstand the strong abrasions of the sea, sand. Lightweight will reduce the weight of the package and make it easier to carry.Translucent Mesh Backpack- 11 x 4.5 x 12, please confirm size and purchase. Heavy-duty mesh backpack with double zip main compartment, big enough to hold everyday items.SUITABLE FOR EVERY OCCASION- Please check the size carefully before buying, it may not fit the portable oxygen unit. You can take it to the beach (the sand falls off and is good for air-drying), or go hiking, camping, traveling (for work), storing sports equipment for indoor or outdoor sports.Increased Security- Comply with security policies at airports, stadiums, and more! Many public places require clear or mesh bags for safety.