I carry with me a Topeak Ratchet DX with the unecessary bits removed; it has a chain tool and I put in a spare quick link (saved my ride once when I had to break and shorten a chain), and also carry a couple of zip ties, a micro pump and typically a "inflate and repair" cartridge, which might be superflouous. I find the ratcheting type of tool is more practical to use than the typical multitool format.
The whole toolkit is pretty light (less than 500 grams with the saddlebag), very compact, and is sufficient to sort out most problems you could possibly run into. Don't carry a tube or levers anymore, tubeless with run flat inserts really takes out the need for that.