Over the years we have acquired an estensive collection of canvas bags. I think we have about 25 (thank you yard sales and clean-up days). Since I shop at Trader Joes only once a month or so, I take along a VERY large pile of canvas bags and throw them on the shelf under the cart so they are accessible when the cart is overflowing at the end of my shopping trip. Plus I usually have two refrigerator bags for the frozen/cold stuff. The folks in TJ are very nice about it. Of course, I always do help bag. (I love TJ's. When the see me coming, they go out and grap an extra cart and keep it up by the register so I can just drop off my full cart and grap the next one. You should see the looks I get from other customers!!! . However, it is the cat food that mostly fills up the cart! We don't really eat all that much in a month..)Anyway, for years and years I have basically been the only person I have ever seen using their own bags. But now every time I go to any supermarket, I see at least a few others. And I have gotten more devoted myself to the point of remembering every single time I shop virtually, using light canvas ones for produce and leaving a couple of extra in the cars. I shop for things other than food only on the very rarest of occasions, but I have never actually gotten a dirty look. Truthfully, once you get used to using nice strong canvas bags, paper and plastic seem flimsy and annoying and even more annoying at home when you need to recycle them rather than just putting them back on their hook where they belong!