I re-use any of the food rated containers and some that are not (such as bleach jugs) but most I do not find large enough for most of my uses. I had a hard time finding containers until I found this company. Since they will sell in any quantity I have found them handy. They also have some good information on their site concerning food storage etc. including a food storage calculator that I have found useful.
http://www.containerandpackaging.com/Itemtype.asp
I have no affiliations with this company.