On my list is to notify credit card company dates we plan to be out of country so they don't put a hold on card. Also, I always pack a spare mask and good save a dive kit which has saved other peoples dives and they have been very grateful. I use detailed list for electronic/camera gear but hubby managed to "forget" son's custom 5mm wetsuit at home last trip to Hawaii so had that shipped overnight express so he wouldn't miss dives. (He is 6'7" so couldn't just make do with rental). Lists are a good thing when lots of gear involved!