With many bikes, especially gravel and allroad oriented models, a third bottle cage is a great place for onboard storage with a bottle-cage compatible wide mount KEG Storage Vessel from Specialized. It allows you to store all key emergency gear-like patches, an extra tube, a micro tool, and a CO2 cartridge, all in one rigid, durable 16oz container that easily fits into any Specialized bottle cage. It can also be great for commuters who don't need to carry a bottle or only need one. Having your essentials at hand can expedite emergency repairs on the side of the road.