I just went to what I've heard is the best bike store in town. I want a tool that will have all or most of the bike-related wrenches all in one small, lightweight tool that I can carry with me. I remember, er, about 30 years ago, having a dumb-bell shaped thing that had 5 different wrenches of varying sizes on each end. At another iteration of this very store a few years ago I had bought a smaller spanner (2 wrench-holes and a few differently shaped prying bits) but the wrench-holes were too small for some of the tasks I needed to perform.
I poked around a little bit and then asked one of the boys working there for a spanner. A what? You know -- a multi-wrench thing? Oh those. He showed me a board downstairs. All I saw were Allen wrench sets. I acted confused and he pointed at the Allen set. Um... those are innies -- I need an outie. You know, I need something that I can use to undo the bolt through the post so I can raise my seat. Oh no -- that's not how you raise the seat -- that's how you tip it. Blither. Luckily at about that time another, slightly older fellow, with more experience, either with bikes or with dealing with idiot customers, came over and told the kid who was "helping" me that "some older bikes" had what I was describing. He also told me I probably wanted a 14 mm wrench (I'd have bet on 11 or 12, personally, but I can check) and that he just carries wrenches in his pocket.