Fydelity's Freewheelin' Roller Skate Crossover Backpack Bag comes with detachable straps that allow you to carry it as a shoulder bag or a backpack. The Freewheelin' is constructed with sturdy 900D polyester and a heavy-duty PVC tarpaulin lining and bottom to protect the bag from your skates. It has 2 -side wheel pockets, an interior stash pocket and a detachable 1-liter water bottle holder.