I just went out and bought a piece of 22 guage steel that I will cut into two 9" by 9" squares to reinforce the inside of the bags. I previously bought a couple of small squares of plexiglass to do the job but I cracked the first one I drilled holes in , so it didn't seem heavy enough to me. The 22 gauge steel is pretty light but very strong so that oughta do'er.
