I'm not referring to the plastic bags that you put your own vegetables in, I mean that at many groceries, including the one near me, these vegetables come prepackaged by the store/distributor and you don't have a choice to buy 10 loose raw potatoes or a whole corn-on-the-cob in a raw husk.

Of course it depends on the store - but then do I drive an extra 15 mins (and emit all that carbon...) just to go to a different store with some loose veggies?