The small camel bak I have is pretty useless for anything more than tyre levers and the bigger camel bak is just too big.
One in-between?
And the stuff you need to carry is easy; go out with nothing and each time you have a problem either add the tools/parts you need or accept you’ll walk home 🙂
Yesterday I damaged the rear rim on a rock about 20 miles from the car, enough for the tubeless to not hold air. Needed a tube, pump and pliers (to get the tubeless valve out). I then punctured that and needed to repair it (snake bite).
Punctured again, it was a light-weight tube, so we put in my riding buddy’s thick 29er (mines 26″) tube. Ran that back; so:
Tube
Pump
Pliers
Patches
Glue
French chalk
Sandpaper
At a minimum.
Plus the weather was very changeable, also at one point needed my gillet and arm-warmers. Along with liquids and food (40 miles and 6000ft climbing).
I use a Camelbak Mule.