I live in Minnesota and HATE having a soaking wet bag after my shower in the winter, it's such a hassle to get it dried off enough not to be uncomfortable when I have to go out afterwards.
I discovered what I assume was an unplanned use for a normal household product
which has solved my problem!
I was experimenting with various products one day, and discovered that Glad Press n'Seal wrap sticks to skin...
...so I take a piece of that, wide enough to go across my abdomen from one side of my bag to the other side of my scar, and long enough to cover from over my belly button, on down. I fold my empty bag up on itself, then press down the top line of the wrap all the way across my abdomen, down over the bag, and on either side of the bag down to my pubic area (since I don't shave there, it won't stick, but it still hangs down well below the folded up bag, so the water just runs off.) If I want to, I can press it further down on the side that goes down towards my leg, opposite the pubic area.
I love this, I only wish there were a way to get the stuff to stick repeatedly, but it won't.