Back in the '70"s the dog bone tool used to be the multi-tool. I have broke a few of them. They are usually made of zinc, so the strength is not that good. One tight bolt head and the tool cracks open. If they were made from a stronger material, it is a good design.

I like non-fixie 's BBB multi-tool. I don't know why multi-tool makers think they are giving us something of value when they provide a bottle cap opener. This could have been replaced with the 12mm wrench that non-fixie and probably the rest of us would prefer. We can always find something to open a bottle with. What is that serrated flattened tool. Is that a tire lever? Whey the serrations? Does it also serve to cut something? This tool looks good for vintage bikes. Here is the link for BBB multi-tools. The issue is I don't see the one with the hex wrenches.

BBB Multi-tools

Is this hex wrench tool discontinued?

I carry a small adjustable wrench.