CHALLENGE TOOL BAG, Brooks England The Challenge tool bag was designed and patented in 1896. It fits to the rear of the saddle and features buckles that guarantee stability and greater levels of security. The strap encircles the tools it carries, preventing them from rattling during transit. A smart, handy tool, and the perfect gift for cycling enthusiasts.BROOKS ENGLAND Sports supplies. CHALLENGE TOOL BAG, Brooks England The Challenge tool bag was designed and patented in 1896. It fits to the rear of the saddle and features buckles that guarantee stability and greater levels of security. The strap encircles the tools it carries, preventing them from rattling during transit. A smart, handy tool, and the perfect gift for cycling enthusiasts. Bovine leather