Invest in multiple packs of reusable, color-indicating silica gel, and ziploc bags. Get the kind that have the sliders, they are more expensive but they are so much easier to use. Just slide and it's confirmed closed. No crazy pressing and testing your recollection of basic color theory.


Another advantage of ziploc bags--carry spares in your pack--is that they protect your gear if your pack gets wet or dusty. Pelican cases are the ultimate solution but they don't go everywhere.