Under ground storage containers

[JD1]

Depends how much you want to put in it. If you go for smaller quantities in a few different places you get the bonus of not having all your eggs in one basket.

Drainpipes with the ends on are ideal at about 5-6 inches wide and about 3 feet long buried end up so you only have to disturb a small amount of surface area. Bury a few along various escape routes and near locations you might be headed to

Cheap as well

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And dont forget where you buried them, the exact spot