Diving in remote areas, with a rugged coastline, I carry...
1: Nautilus Lifeline, left pocket. (Thank you Rescue 21, hope I never need you)
2: Dive Alert, left pocket (Nothing louder out there)
3: Storm Whistle, left pocket (Works without a tank or air in tank)
4: Signal Mirror, left pocket (Best daytime signaling device, and what was seen to save the folks in Cozumel when the boat sank)
5: DSMB with spool, left pocket (Everyone needs to carry an SMB in open water)
6: Cut off steak knife mounted to front of harness (Whacks through rope like cutting butter)
7: Shears, right pocket (My goto cutting device, and they will cut through wire leader)
8: The future holds a PLB aka P-EPIRB
Take me out of the ocean and all I carry are cutting devices, and maybe a lift bag if on a recovery mission.