These are available from Brigade Quartermaster. No need to worry about customs or import duties...

I have three in the garage right now.

Scepter cans are what the US military use right now so they will certainly handle camping duties.

However, I would point out that some people, including myself, have had cap leakage issues. Although this may be a thing of the past (the post I saw was from a few years ago, I think) you should be aware that there are three (3) caps that must be firmly sealed to prevent leakage. The big filler cap, the smaller "convenience" cap, and the vent cap.