THSENG..
these are photos i took for another campers site a few
years ago..i tryed filling with water first but could only
pump a few times before it became to hard to do..then i tryed
them dry and it was pumping up a bike tire and the dents
"crinked" out..i also did stuff like put a wet rug over the
bottle for a "blast mat" but found that was not nessary.