Try vaccuum packing to remove the extra air. A food sealer, maybe? ...
Hey, that's not a bad idea. I picked up a food sealer just for sealing up some non-food type items and I know it's pretty good at getting every little bit of air out*. I'll have to give it a shot, thanks.
* - Why do I say this? Tried to vacuum seal some backup items (extra bandanna, small knife, small flashlight, etc. along with a couple of individually packaged
hand wipes. Big mistake, the packages burst and the liquid went everywhere (and they were
scented wipes, which made everything nice and smelly.