The best fuel cans out there:
Current-issue NATO can
It's a bit pricey, but it won't leak. We used the water versions of these cans on our aircraft for our just-in-case water supply (on top of what we carried ourselves).
I got mine a bit cheaper...

Current-issue NATO can
It's a bit pricey, but it won't leak. We used the water versions of these cans on our aircraft for our just-in-case water supply (on top of what we carried ourselves).
I got mine a bit cheaper...

Those are the biggest piece of junk gas cans ever made IMO.. 

In fact for a while there were no metal cans sold (legally) in CA because they hadn't invented a crap-spout for them yet.