Hi Jay, and welcome aboard! The Gower is going to give you a slightly different problem, as you'll have plenty of Salt hanging around in the atmosphere! Some people suggest slabbing, but not all slabs I've come across are totally sealed around their circumference (they wouldn't be watertight, let's say, so definitely not atmosphere proof), though I guess a fine bead of extra adhesive around the edge would not be beyond the capabilities of most DIYers. I personally feel reasonably happy with the 2x2 glue-shut flips and a purpose-designed wallet/book that holds them. I keep these wrapped in a plastic bag, which I fold around and then elastic-band the whole thing together! I think the silica gel would be an excellent addition, and I know many do use the sachets! As for security, I can't really share my ideas here, but it is a major concern, and I do spend a lot of my life carting a weighty bag around! I'm sure there's a million more ideas to come! Welcome again!