I've used a canvas shopping bag since high school, but I grew up with that. If we'd used store bags, my grandfather would have packratted them away someplace and we'd still be trying to think of things to do with them 20 years after he passed on. :P

I don't mind using plastics, but if I don't have to, I don't. A lot of my gear is nylon, and you can't have a computer without plastics, but it is like strong drink- moderation.