One thing I do to contain plastic dust and debris (as in polystyrene parts) is to attach a cheap, kitchen apron to the edge of my work desk using clamps and then "wear" it while working by putting the loop over my head. It catches all the dust and also dropped parts (they don't get lost to the carpet monster any more!)
So, with the hem clamped under the desk edge, and the waist strings also wrapped around the clamps, it makes a nice pocket to keep the stuff together. When not using it, I loop the neck strap around one of the clamps to 'close' it and just periodically empty the contents in the outsite waste bin. Also, can wash it in the laundry so it stays clean (I got a two pack, so always have one in use in the 'rotation'.) Cheap, white cottone aprons, best trick I've devised in a long while for my 'dry' sanding. Clothes stay clean too!
Regards, Robert