I had thought about holes, but the problem with that is that I had some tent stakes and rope stored in a cloth bag and a couple of other cloth/canvas bags of assorted small "necessities" and they all got soggy and started to mold. I looked over the seal and it all seems to be in order, but what do I know. Just gonna keep an eye on it.
Lynn, thanks for the post and on the sofa: think I sort of side stepped the issue and satisfied the dear wife, for a while. We just found and ordered a new mattress topper. It's only 1" thick, extra firm and weights only 14lbs. Much more manageable than the heavy 3" one we have now. And should stow behind the sofa when in the sitting position, and she can use her nice sofa again. Should get the topper in a couple of days and will take a short 3 day trip in a couple of weeks to give it a try. Let you know.