One of those swiss-army carry everything jobbies, or a more simple one, and separate chain breaker?
got a crank-bros one recently and it seems pretty good. tend to have that and a leatherman in my bag with some zip ties and gaffa tape.
fix the world with that tool kit.
Been using my Alien with chain tool for yrs-nice little bit of kit.
Maybe buy sram power links too?
I did have an alien but it's got loads of tools that are no use for my bike, and it's kind of big... So I got a Hexus instead, which to me is pretty much perfect.
sks toolbox travel works well for me
as above - CB19 with little Leatherman. Couple of powerlinks, bit of tape and some zip ties.
I have a Crank Brothers one (CB17). The chain tool on it is better than my 'workshop' one.
one of those folding allen key tools and a seperate and decent chain breaking tool for me.
been down the route of all-in-ones. and they just don't work as well as seperated tools.
Oh, on the subject of chain tools I reckon the Topeak ones in the Alien and Hexus are more than good enough for the job... Better than most seperate chain tools tbh.
CB19, although it's mainly used as a chain tool as I usually end up carrying a folding set of allen keys.
Had a Leatherman Charge Tti, but it 'disappeared' at work (gutted). Never had a use for it on the trails though.
i have a topeak hexus and the chain breaker on it is better than most dedicated ones that I've had (and broken)