This is an awesome idea! I think every store should start having some sort of incentive for you to bring your own reusable bags. CVS has a new incentive: Greenbagtag. You buy it for $.99 and attach it to your reusable green bag. When you check out, have the cashier scan your tag and every 4th scan you earn $1 ECB. This does not have a limit so you pays for itself in the long run. And you save the environment!
Thanks Coupon Cravings!