Stow my traveling tools in my smallish seat bag. I have tire-irons, multi-tool, CO-2 inflator w/2 cartridges, spare inner-tube, tube patches, chain links, KMC missing link, link master pin. This fills it not expanded, expanded I can drop a CO-2 cartridge and add a lightweight windbreaker.
Also have a mini-pump that is mounted aside the water bottle cage.