【DURABLE MATERIAL AND LIGHTWEIGHT】- The transparent swimming backpack is made of heavy-duty polyester mesh, which can withstand strong abrasions from the sea and sand. The lightweight design reduces the weight of the package and makes it easier to carry.【Transparent Mesh Backpack】- 11” x 4.5” x 12”, please confirm size before purchasing. Heavy-duty mesh backpack with a double-zippered main compartment, large enough to hold everyday items.【SUITABLE FOR ALL OCCASIONS】- Please check the size carefully before purchasing, it may not fit a portable oxygen unit. You can take it with you to the beach (sand falls off and is good for air drying), or go hiking, camping, traveling (for work), store sports equipment for indoor or outdoor sports.【Increased Security】- Meets security policies at airports, stadiums, and more! Many public places require transparent or mesh bags for security reasons.