An awesome xs scuba dive knife
dive light with a camera pole and a camera on it ( this was a big ticket item.
one split fin
one dive mask
I have taken a few measures to improve my chances on not losing stuff like leashing some of these items down. But it seems some of the other items will have to fall under the know where your gear is rule, and have a specific routine to follow to check on it.
Have you lost a few items on your dive or even after your dive?