We start VIRTUALLY naked. in goes the suit then the skin then the wet suit and booties, fins mask, and perhaps a hood. Then we virtually set up our gear . in goes tested BCD, in goes the regs in goes the computers and testers. In goes the weights. We then virtually get out of the water.. In goes the towels in goes the log books in goes a wet bag. Then we VIRTUALLY load the special stuff. In goes the camera stuff ect. Done bag goes into the car. Do the same for the other persons dive bag. and in to the car. Then the same process goes for site stuff. tarp food, changing room. butt wipe, cloths drying lines repair kit etc.
I`m using that way between hotel and boat. Or when I collect equipment to the trip.
Starts to think from bottom: Fins - taken, boots, socks, wetsuit, hat (I do not like hood), than follow to opposite side for equipment: mask - taken, mouthpiece->regulator (both, left and right, I prefer use two), harness and wing. left pocket (buoy), right pocket (empty, for loot), left knife, right scissors, left hand - empty or compass, right hand - computer or watches and depthmeter, doublenders or Al. carabines. left hand - camera and/or lamps. and last - two tank strappings.
When I go to the trip and starting to collect all gear - I just use list of paper. First column - clothes (ALL! including dressed). Second - equipment. third - medicine. fourth - tools (like multitools, antimosquito, pieces of cooper wire - very usefull thing, lighters, plastic fast ties, adhesive tapes, etc.).
When I think, that nothing forgotten - I takes LAST YEAR list!
(I store all documents from at least 5 years old) and previous, to compare and check, what I forget