Originally Posted by sfrider

A small topeak case, clip only (no velcro or straps). With tubeless tires I don't carry a tube or patch kit anymore; the sealant is in the tires. Two CO2 carts, a small Lezyne inflator head. A small cable luggage lock - just to prevent a grab and run should I need to turn my back to the bike for a moment. A 4mm hex key, a 3mm hex key. A couple of disc brake stoppers (in case the bike needs to ride home in a car sans either wheel). Some tire plugs, a couple of spare valve cores, valve core key, and a very small bottle opener. Being clip-in the bag is very easy to move between bikes, or take off to get something out. With the Canyon I will also need to carry a 5mm hex key.

Oh, and for the weight conscious among you:



Oh, I also replaced the standard zipper pull with a piece of string. It would tap against the bag... continuously... driving me mad.