The Storm 1 Ball Spare Kit Black Bowling Bag lets you add a spare bowling ball to your rolling ball bag. It attaches right to the retractable handle of a rolling bag, conveniently loading an extra ball and accessories without adding unwanted encumbrance. It's quite tough, made from 600 Denier material and backed by a one year limited warranty. This is an inexpensive way to expand your options for transporting bowling gear so you have everything you need to achieve top performance.