I never had a reserve on my rigs (well, they weren't meant for use except in an emergency
(Softie and National)) so I never had an AAD; but if you don't really put negative pressure in the space-saver bag and just use the water/humidity protection you get then that should be enough when around salt water
. I have numerous Pelican cases and love them, they store everything from military gear
to replacing my soft ditch bag. But weight is an issue, plus they make great targets for theft, as those who would purloin them say "such an expensive case must protect something even more expensive and valuable".
This thread prompted me to go on eBay last night and now I'm the owner of another (used) Pelican case