They’re essentially totally water- and air-proof. We used to keep our chicken feed outdoors in one of these and never suffered a leak or spoilage (at least until a squirrel made its way into the bin through some herculean plastic-chewing effort). Toss in a few oxygen absorbers and they would be perfect prepper dry food storage containers.
They also sell replacement gaskets, so if you open and close them a lot you don’t need to worry about permanently ruining the seal from wear.
