Just upgraded to a HH VHF/DSC radio with GPS that floats and also uses regular batteries
I know the radio works because it has already gone swimming in the Chesapeake Bay😱
I now carry a telescoping fishing net to retrieve things out of the water.
Added a Bimini Top, you could also use an umbrella. It makes being out on the boat much nicer and offers protection from sun and rain
Added a small spear gun
I also pack things like cloths and extra batteries in a food saver type bag.
I use my food saver/ seal a meal machine to make custom bags to keep everything airtight and waterproof.
Not to mention it takes up less space.