StiX floats are the easiest way to lighten up a heavy DSLR system underwater. Made by 4th Generation Systems, they are easy to put on and can be cut away as necessary.
I’m just back from a 10 day live aboard dive trip to the Solomon Islands. I had packed 5 different cameras and systems to do a round table of testing and comparing in order to write some practical reviews.
As usual, I spent time going over each camera system making sure I had packed all the necessary batteries, chargers, lenses and attachments. All was reasonably packed into two cases. One was carried aboard and my Seahorse hard case and dive bag/clothes checked. With everything spread out the day before, I tried to balance their weights, airline requirements for lith-ion batteries, etc. What I didn’t do was to make sure that essential chargers, batteries and mounts were all packed together with each camera. Oops.