I recently bought a power ratchet from Amazon (some Chinese brand for $45) and I like it very much for the major engine servicing jobs. Astronomically speeds up taking your cooling system and heat exchanger projects out for of servicing. I got the idea from watching one of my auto mechanic friends who gets paid to beat the time books. A 5/16" socket on one of these is terrific for dealing with hose clamps in hard to reach places. Maybe not something you carry on board all the time. I prefer a tool bag with lots of pockets for my basic tools so I can see what I am grabbing. Rolls are better for wrenches. Over the years, I need to clean out the tools I am carrying on the boat when I have not used them for a year or two.