Get your mind out of the gutter. I’m just talking about wrenches. These are my current favorites. Top to bottom that’s a Bacho shifting spanner. That hole will fit over the lug of old type fire hose couplings and the fish mouth with the serrations will lock onto nut or rounded off crap but I’ve used it in other ways as well.
Then there’s the Bahco pipe wrench, gotta love it, quick to adjust and when you squeeze the handles it just grips tighter (hey I told you to get your mind out of the gutter). This guy will fit in a tool bag but I think they make them bigger too. But not sure they’d work as good as the old reliable, classic Rigid ones (you just won’t leave that gutter will you). Remember the calendars “every woman loves a rigid tool”. Can’t imagine what manner of mayhem it would cause if I hung up one of those calendars on the ship now.
Finally the classic monkey wrench. Fell from grace somewhere along the line but if you work with hydraulic fittings a lot this is a perfect back up wrench for hose fittings like JIC swivels, tubing fittings and such. It has ample and wide jaws (for the last time, get your mind out of the gutter) and small enough for the tool bag too. Think I got this one from McMaster-Carr.
So these are my go to guys but always looking for good ideas. Just no Channel-locks - gave up the Polish knurling tool a long time a ago. Well I bet there is one in that tool bag at the bottom somewhere - you know, for emergencies.