Of course, the problem for Coke is no one sees people drinking their iconic bottles and they lose the marketing opportunity.
So an anonymous party created a Coke bag and supporting ad. You can see the reasoning and bottle-bag in the commercial below:
It seems like a pretty neat idea and I wonder if Coca-Cola would consider it. The video does have the feel of an internal product presentation though.
The plus over regular plastic bags? The Coke bags are biodegradable and I'm thinking Coca-Cola either provides them to the vendors for less or for free.
As for waxed cups? They're not recyclable and I'm going to guess they cost more than a plastic baggie.