What I have done that works great is to use a shop vac with a trash can cyclone. That way you have the suction power you need with the volume of a 30 gal trash can. Get a lid from Amazon.

Note that a big shop vac can collapse a galvanized trash can if you plug the hose, so I have taken two trash cans and glued them together with expanding foam. Makes a very strong can for this application.