Brooks is delighted to announce the result of our successful collaboration with the Royal College of Art in London (RCA). For the first time, a new range of moulded leather bags will be produced at the Brooks saddle factory in Smethwick, England, using the same machinery and techniques that have made Brooks Leather Saddles renowned worldwide. The B4 is a frame bag designed to attach to the bicycle, offering a convenient solution for carrying spare inner tubes or a multi-tool.