The downside of containers is they really absorb heat from the sun, but since sun is not a real probability early on after the pole shift, it's probably a good idea. Make sure you buy one that doesn't leak. That's usually why they are for sale.
Offered by John.
My current thinking is to use these things for supplies storage. One could load and pack them for the pole shift in the city. Support the walls with cross supports while packing as needed. Transport and put them partially underground at the site.
Offered by Mike.
The intermodal shipping container is a beautiful tool as is. Its very nearly the perfect box.
Offered by Steve.