About a year ago, I took three samples of a very nice Guat, and put them into storage three different ways. One sample was held in a cloth bag, along with a piece of burlap, and put into the bottom file cabinet drawer in the office. The second sample was also put into this drawer, but was sealed inside an air tight mylar bag. The third sample was held in the freezer, inside of the same type of mylar bag. For a bit more info, check out the blog post from a few weeks ago.