these are great tips! i recently bought some of the buckets (pp), and I've been freezing all my grains and legumes upon purchase for a long time for exactly that reason

i'd be nervous about putting dry ice in a hermetically sealed container like a bucket

a thing i've noticed with storing food in plastic (pet) coke bottles is that they never seem to get beetles and that they tend to collapse a bit over the first year or so; i suspect that, even without a fe/nacl oxygen absorber, the food oxidizes enough to consume the oxygen initially present, which reduces the gas volume about 20 percent and kills any beetles initially present

my older notes on the topic are at https://dercuano.github.io/notes/food-storage.html