I looked at several options myself. I'm sure the best and safest drum would be a metal enclosure. However, I wanted an inexpensive drum that would not be too heavy. I found a blue plastic 50 gallon drum on craigslist for $25. You can see it in the left hand corner of the picture. This drum has a thick plastic top that has a rubber seal along the interior of the lip which contacts the container. A metal strap seals the system. It works great, is light and was cheap. My cyclone is mounted 9' above the floor.