Vaughn, It looks like you have a much more modern version I would only use this pack to actually carry the camera on hikes, I wouldn't think about letting tsa and baggage handlers get their mitts on it. I too use the old sleeping mats for padding on the bottom. I put a piece also on top of the ground glass and still have room for holders on top of that and my dark cloth. The part of the pack that is facing my back has an aluminum frame (inside the pack) that I didn't want to be against the glass that is why it is facing out, I figured it would have less chance of pressure on the glass if it faces out. No problems yet, but I don't toss it around without thinking
Jim, Here's a link to MEI if interested