Best Cache Storage

[Scythe13]

Okay people, here's a fun one that Tartar Horde has inspired me to doing.

I want to start making caches!

I have an idea of what I will be storing, but I need to know, how do I keep all the items safe?

I was thinking ammunition cans. But those would rust. I then got to thinking about buying a grave plot and caching a load of stuff into a coffin (grim I know, but it's still a wonderful idea hu? I'll probably go down this route at some point. The funeral of BOB Edward Dale Carry).

What about things like tupperware and that kind of thing?

If I'm burying them, how deep should they be burried?

I'll be burying fuel in those plastic cans you can get, green for petrol and red for diesel. You know the cans I mean. I was thinking of going for a jerry can, but the issue of rust sticks in my mind too long.

Please help if you can.