Chris, you mention about squeezing air out on your last post. It's one of my bugbears about any waterproof roll top luggage, I always seem to get air trapped inside, admittedly more with my roll top bag than my Enduristan panniers.
To get round this I've put in a Boston valve as used in inflatable boats.
I just melted a hole the right size with a soldering iron and screwed the two parts together, no glue needed. OK so the valve is designed to keep air in, but a push on the central core lets air out as you squeeze the bag.
The other perk when installed in a roll top bag is that you can use it as a pillow, just trap air in as you close the bag and then let the correct amount out for you as you lay your weary head upon it. I've even blown extra air in my bag, stood it on end and used it as a rudimentary stool.
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