It had to be mesh. For carrying swimwear, gym clothes, sports equipment, and more, there's no better bag than the TYR Big Mesh Mummy Backpack! Built to hold 40 liters, it can really pack away your gear. And, constructed with mesh venting, the bag provides wonderful drainage and dries in no time. It's given barrel-lock closures so you can close ties without tying them and still have secured gear tucked away while still easily accessible! This lightweight backpack features a side zipper pocket for additional gear as well as a built-in water bottle pocket to keep hydration handy! And, once it's empty, it's fully foldable for simple storage! You're sure to be meshmerized with this Mummy Backpack.