Got this under-the-saddle tool roll (or whatever they call it) from someone here, I believe, and have been using it almost exclusively ever since. I used to be the guy who took a bare minimum with me in a tiny wedge under the saddle. No more. Sometimes I even carry a spare tire in addition to two tubes and all the rest of the tire issue tools. Fits plenty of small tools and there's still leftover room for a spare battery for the NiteRider light.
Been using it a lot in recent months on the Davidson:
I had a cool little single compartment Acorn handlebar bag, but didn't like the mounting; it swayed fore and aft too much for my liking.
gugie was consulted, but he figured a decaleur was overkill, so I passed the bag along. One day I will get a matching, larger bag for the front to hold the food, camera - and maybe something enjoyable to drink
DD