I'm guessing it's the double layering on the inside and bottom that does it. Just to make sure they stand up, I took a skein (my trekking yarn skein) and stuck the project in a bag at my feet. 20 minutes later, it's still standing up. I never noticed that, but they do!
Now since I don't add any stiffener to them, they will still stand up by themselves after being washed. In a stiff wind, they do fall down. There were a few of the earlier bags made with thin fabric that won't stand up for long. I started backing them with fusible interfacing to make them stiffer.
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