My BF has a xootr crossrack and I pull the pin and remove it for rides where I don't need to carry stuff. In those instances, I carry a tiny patch kit, CO2 unit, wallet in a very small bag crosswise over my back. It's light, goes with me, minimal. My phone attaches to the bike. I could actually put all of it in my jacket pockets but I find that uncomfortable. My bike has 2 water bottle mounts. I live in California so don't worry much about rain, but my jacket is rain-resistant, and also becomes a vest with magnets for the sleeves. My "tools" are a small folding set on my keyring with my bike lock key, which has a carabiner and clips to my pants. I find carrying the CO2 much easier than a pump and, honestly, since I started carrying the flat gear I haven't had one =). I could shove a spare tube under my seat if I wanted but I'm proficient with a patch kit. If it's beyond patching, I'd call a friend and fold it into their car for a ride to a bike shop.