I took some time out of my busy schedule, just for you, Ole' Buddy, and ran a couple of highway tests on your theory. You will be disappointed to learn that clean, unused black trash bags, at sixty miles per hour, became roadside litter. :)
Sure! It's a 9-ft patio umbrella that I use to deflect the sun/heat from the windows. It angers my sun-worshiping cats, but it keeps the house almost 10 degrees cooler.
I have one in my golf bag. It was a gift from the local Chrysler dealer. (gee, I bought a truck from them in 1997.) The umbrella is still doing better than the '97 truck.