TomWhat about a Food Saver Vacuum machine, you can make the bags as long as you want,and there 2-3 different widths etc....... I had a friend that used to use one of these machines and dyed his thin laminates for gun stock coloring.HTH'sDon
My un-scientific opinion on foam is that the lowest grade of white EPS foam distorts at 13 HG. Pink Foamular 250 and the slightly stronger Dow blue sold in super hardware stores start to deform at 23 and 24 HG. Dow hi-load 40 takes full vacuum with a little care at the edges. Hi-load 60 and Plaza Mate easily take full vacuum, even with sharp edges.
Sorry Im late to the discussion. As a Tool Engineer at Boeing, we used silicone Vac Bags for reusability.