Behind-the-seat bottle cages and a saddle bag

[Bluetree]

Siume, I can fit this much into one cage rocket. The only thing I'd advise it so make sure there'e no extra 'air space' around the metallic contents (i.e. cell phone next to steel tools) because they might rattle together if you ride over a bump, which can get annoying. After I put my tools in, I just stuff it tight with kleenex (which can also come in handy for wiping grease off your fingers) to keep it from rattling.

And, as I mentioned before, if the rocket isn't snug within the cage and rattles, a sock covering the bottom portion will do the trick.