This may be a frequently applied solution, but I haven't seen it yet, so maybe this will be helpful to others.
I built a thien baffle into the ring that came with my harbor freight 2hp dust collector. I could put that on top of a barrel, suck through the barrel, and then empty the barrel when it fills up.
But, I really wanted the ease of emptying a bag. Tie it up, toss it out. Nice and easy and clean.
To use a bag, my first inclination was to have the DC blow through the bag/baffle (as opposed to sucking through the barrel/baffle). Blowing through the bag keeps it from imploding on itself like you'd get if you tried to suck through the bag. But this made the footprint of the setup bigger than I wanted.
So, I instead built a stacked assembly and put a mesh fencing skeleton inside the bag. When the DC is turned on, the bag tries to implode and sucks tight to the skeleton cage. The dust falls into the bag same as it would into a barrel. When the bag is full, just shimmy the cage out and put it into the next bag. Tie up and toss it out.
Tests were a success. We doubled up the cage and it holds up to the suction easily.
Hope this is helpful to anyone.
dust control baffle small.jpg dust control stacked assembly small.jpg dust control cage small.jpg