I now run the Burrito Pack on multiple bikes. It can fit a tubolito tube (29-inch mtb or 700C gravel), 2 pedros tire levers, multi-tool, 2 co2's (16oz or 20oz) with valve, and a pack of extra hardware with room to spare. All while still being tight and compact. I also really like when you have it off and unfolded, you actually get a pretty big surface to set small parts on. On the mtb's it is great how it does not interfere with the dropper post and doesn't touch the post at all.
This is one of those products that when you see it online you hope it's going to work because the photos don't do it justice. This pack is THE BEST SADDLE BAG EVER! Carry a little or a lot. Doesn't rattle. Looks very good. And most importantly, you don't have to remove it in order to throw your bike up on the stand because it doesn't even touch the seat post.
I carry 1 tubolito (40c), 2 CO2 with nozzle, 1 large Cane Creek multi tool, 2 Pedro's levers, and a good size spare parts pouch. Rolls up nice and neat and doesn't look bulky at all.
I use this on my gravel bike so I can carry a few more tools than when I'm on the road. The wrap style means you can carry as much or little as you need without the dreaded dangling sack look. The strap is nice and long so you can really cinch it down right.