Why not bury or keep underground?
Underground in Florida! I know I’m talking vacuum sealed but the biological life forms that live in the soil would make this virtually impossible. Termites, moles, everything you can think of. We even have these animals that work their way across our pasture and build mounds of dirt in their path. Everyday I come out and there is another dirt pile about 2 feet away from the previous one from the day before. It’s hilarious. And the path maintains almost the same bearing week after week.
That's okay if your container won't rust and will keep rodents from gnawing holes in them.