The nicest one I've used is this Lezyne Blox 23.

When I first moved to Europe, I bought a cheap used bike and needed to do some work on it before my stuff got here through the Panama Canal. It handled all the stuff that I needed at the time, together with a socket wrench set. I also carry a small 15 mm Craftsman wrench that I picked up years ago for my fixed gear and internally geared bike.