I don't use a seat bag. I have two CO2 cartridges, a tiny inflator head, a standard tube and a few other tiny items in a zip lock bag, that fits in a jersey pocket. An ultralight tube wouldn't be an advantage. I carry two fulcrum tire tools. There's something wrong if a bead jack is needed for a used tire. No extra sealant necessary if you plan to install a tube.
Last edited by DaveSSS; 04-01-22 at 07:30 AM.