Jabbur, Thanks for the synopsis of the videos.
I've tried many ways to rough up the edge. (Sand paper included)
No success on some bags.
I've attempted to introduce air into the bag but if you can't find a seam to begin with you're out of luck.
Shoot if I could get air in the darned thing I could open it.
Andy, Now why did you remind me about those produce bags.
I shared a good rant with a nice lady in the grocery store one day about them.
I'm sure glad I don't use paper plates if they exhibit the same behavior. The men in white coats would surely be after me then.