>"If you have a vacuum bag sealer, you can make any size you want out of regular zip bags"
I was pretty sure that was true, but didn't want to say since I'd never done it. We are, as Alaskans, are statutorially required to have 2 operating plus one inoperable vac-packer at all times.
Plan ahead and you can make 2 to 4 out of a single, larger ziplock. And you can choose between sandwich-bag, regular- or freezer-weight bags.
For stuff I DON'T plan on using (first aid supplies, the extra backup toilet paper, or fire-starting supplies (in my life jacket while boating and flying in small planes), I actually vac-pack them. Makes it small, waterproof and the material is tougher than ziplock bags.