Actually, that bothers me. While the Apple plastic drawstring bags are very nice, it's still plastic and most people don't reuse them. I would really like to see Apple move to a cloth bag (although my understanding is that you now only get a plastic bag if you ask for one). I'm sure Apple would design a cloth bag that is more special and better designed than anyone else's cloth bag.
I always reuse those bags forever. They're great for bringing my wet swimware from the pool (they're plastic so they don't leak) and you can strap them on your back when walking home because they can be worn like a backpack.
I've seen my colleagues with them as well, they're so cool nobody throws them out.
I always keep Apple's packaging as well, in case I want to resell my stuff. It's worth more boxed. And their Mac packaging is really very minimal now.