I'm not really bothered about the charging of bags, but to be honest if I'm gunna be charged for them I generally just wont use them, When shopping at pak 'n' save I generally just don't get them, most of the time because I forget, I have a collection of reusable bags but I usually forget those too lol, and when I forget them and am shopping somewhere where I don't have to pay for bags I use the plastic bags. If I am going into a store for a few things I never bother with bags, I'm that person that you see trying to juggle holding like 10 items lol then just dump them in the car.
I think what frustrates me is not so much the supermarkets, but the retail outlets that insist on putting every single purchase into a plastic bag without asking if you need one first? I work in retail and unless a customer is buying more than a couple of items I always ask if they need a bag, funnily enough probably 7 out of 10 of these people will say no when normally they would just take it bag and all... hehe my little bit to help save the environment
Lol sorry I rambled good and proper just then huh! But my 2c!