I see a lot of people mentioning the stuff (tools, tubes, etc.) they have in their seat bags; am I the only person who's dispensed with the seat bag and carries the tool / repair stuff in a wide-mouth water bottle?
Easy to move from bike-to-bike, keeps a firm cap on how much stuff I can carry (tube, glueless patches, CO2 head/cartridges(2), Pedros lever, multi-hex tool); can mount it wherever (I have both frame mounts and a behind-saddle mount) - or even in a jersey pocket if need be; waterproof; easy to check contents (e.g., if it rattles a lot, I didn't replace the inner tube yet).