I clip the weekly coupons and ad pictures of the sale items (that don't require coupons) from each store I plan to buy and tape them (small piece of tape on the top of the coupon) to an 8-1/2 x 11 sheet of paper, organized by store. In this way I don't leave the store without buying what I intended to buy. I fold over the piece of tape onto the top of the coupon when I hand it in when I pay for groceries, At the end of the week, I toss the sheet of paper with unused coupons and pictures of sale items I decided not to buy after all.
I carry a small envelope in my purse with manufacturer coupons, organized by frozen, boxed, bottles, personal, cleaning and pet food.
Welcome aboard, PINGEE #84.