Free, I didn't know about your buckets of grain - was that in your journal? Great score! I haven't used mylar bags myself; like you, I rotate what I have, and don't plan on *many year's* storage. But I have read that the bags will seal with a hot iron - fold over the top, and press them on a flat board (with a cloth between). If you don't need/want them for dry food storage then freezer storage, with tape (as already mentioned) might be a way to get more use from them. Or wrap your birthday and Christmas presents in them . Or cut them into strips and hang them in the fruit trees to keep away the birds.