Sorry this is a delayed response, but i used to work in a donut shop and
they have air tight buckets that fillings come in.  If you go to a donut
shop and ask for one some may give it to you for free and others may charge
a few dollars.  just was and rinse very good with bleach and soap.  I use
them for my ferrets and they work great.
 
Merri, Sarah and Allie-gator
[Posted in FML issue 2043]