RE: Does anyone remember Aero Pack International's "G-pack" foam?
I remember "G Pad" foam that was touted as the best thing since sliced bread for protecting your radio gear.
Exactly the same stuff is now used to make ground-pads for camping. It's a closed-cell foam available in different colors and thicknesses.
It used to cost big-money to buy G-Pad but now I can buy a whole ground-pad for $10 and that's about a 6'x3' sheet of 3/8" or 1/2" foam.
What surprises me most is how many folks just use velcro or even cable-ties to secure their receivers to the airframe - with no padding at all.
I've yet to damage a receiver in a crash, even after some 45 years of RC flying. I put that down to the excessive use of foam padding (oh, and amazing flying skills yeah right! :-))