ARENA SPIKY III BACKPACK 45 Easily carry your swimwear, gear and towel in our Spiky III Backpack 45. There is a spot for everything for quick changing room transitions. Keep your tech and wallet in the front zip pocket, and your clothes and accessories in the roomy main compartments. Finished with mesh inserts to help remove moisture, this athletic bag comes in an array of colours with contrasting zips and our name in magnified lettering.