Just out of curiosity for the chemistry buffs out there, is it possible to manufacture a plastic bag that doesn’t do that cracking sound? Silent plastic bags when they flex?
Care to give me a formula, manufacturing process and estimated costs to get me started? 
Sorry to be dick, but if I or anyone else had that secret to patent, why would we post on a MB for you to take advantage?
Sorry to be dick, Dick 
but I wasn’t aware that silence in plastic bags was a desirable quality, hence marketable, hence stealable.
Hanh? 
It sounds like the plot for Flubber III. “The professor’s developed a silent plastic bag, and the Russian Mafia’s trying to steal it…”
“On tonight’s news, the latest in the fight for Shopping Bag Silence. New legislation now before the Senate will require all bag ladies and street people to refrain from crinkling in public places…”