You have to spend $40 to get the bag for $20. So essentially you would be spending $60. You can use coupons on the promotion too, so if you had a $10 off a $30 coupon  you could get everything for $50. The plan is to let people stack and use multiple coupons that day so you don't hold up the line doing multiple purchases. You will still have to qualify for each coupon though. So if you have a $10 off a $30 and a free item with a $10 purchase you would have to spend $40 to use both coupons.