When I got my Sterling Wave 4x8, I realized that it is smaller and lighter than my previous case, which was a 3x5. It probably weighs 3 pounds when it's empty. At most.
However, if I HAD to minimize my case, I could fit everything in a 2x4 as long as there was a sleeve for my jump cue butt. However, I'm really happy with my current 4x8.