Built For Athletes Black Pro Series Gym Backpack in Size 45L, Sports Direct. Designed for the dedicated athlete the Built For Athletes Pro Series Backpack comes with an extensive spec of the latest technology and ergonomic design features. Engineered for superior comfort, reduce odours from sweaty gym kit and provide protection to valuables via shock-absorbent and fully waterproof compartments. The Pro Series pushes the limits more than ever and is designed specifically for those who strive for supremacy in both their training and their belongings.Looking for alternatives to stores like JD Sports, eBay, SHEIN, ASOS, Next, Best Choice UK, Very, Decathlon UK, Argos, schuh, Temu, BuyBetter, or Nike Official? Discover our unique selection.