Pinarello Most Silos waterproof tool case can be carried in your pocket or in the waterbottle cage of your bike.
It's waterproof and large enough to hold anything from tool to a spare tube, Co2 and cold hard but not wet cash.
Don't blow your style with a nasty saddle bag. Keep it tight with the Silos
Best of all the water bottle tool, etc.holders and it works in you back pocket if you need 2 water bottles!