I have been carrying an adjustable wrench, a set of metric hex keys, and some no-name nylon tire levers in a seat post bag for on ride adjustments/maintenance/repair. This allows me to do about everything on my bike.
Lately, I'm getting sick of hearing everything jiggle around, and I was looking at getting either a Park MTB-7, MTB-3C, or a Topeak survival bag (which has the multi-tool, bag, patch kit, etc).
I am also looking at getting another seat post bag anyway (one that I can remove and reinstall in a few seconds anyway).
What (among the ones I listed) or any others that I might not be aware of are the best and most functional multi-tool? I'm looking to do about 6-8 centuries this season so I need something that can last, is 100% functional, and isn't going to weigh me down too much.