This MSUB/RSUB bag will fit up to a 29er replacement tube. It is designed to sit on the top tube of the MSUB/RSUB frame and... Read More has three connection points for the frame and head tube. This bag is large enough to carry a phone and a few smaller items like keys, energy bars or CO2 cartridges. It can also be used on a traditional bicycle top tube. Please note, this bag is not waterproof.