I prefer the glass jar method, stored in a dark room, that I've described by following the link. The hand warmers can be used for 5 gallon mylar bags because of their size, so use a really big jar! I'm sure with a little digging a reader can find the equivalent CC absorption rate. The paranoid can buy them without fear of government tracking and being labeled a prepper, since they "only keep the hands warm."
Which brings me to another question. What everyday products can be secretly used by preppers for other uses?
Keep Right On Prepping - K