I got mine in something like this,
http://www.usplastic.com/catalog/var...riant_id=74211
The chemical place that sold me the meth also sold me the container for like $15, which is a little less than what it costs new. I think they count on return customers.
It's air tight, I know because when I opened it after the weather getting cold, it sucked in a bunch of air. That and you can get the hand pumps that screw into the top fitting.
I found a pic of what I have.