for me when it comes to Altoids tins and other kits that size, the Gerber bags or the condoms win. Anything smaller than an Altoids tin is condoms all the way. Nothing packs down anywhere close to a condom removed from its wrapper and nothing anywhere close to its packed size hold nearly the same amount of water. There really is no comparison to the condom. I suggest getting over the social stigmata if you really want the most water storage in the smallest packed space.