Having one set is good, but having three or four sets is even better. Consider that some of the coupons are BOGOs (buy-one-get-one) or flat-out freebies, like "This coupon is good for one can of XYZ Brand French-cut Green Beans." Freebies and BOGOs are like cash in your hand, so it's nice to have multiple copies of the coupons. Also, some retailers, particularly grocery stores, let customers "combine" coupons on certain items, up to a limit of about four. So, if you have four coupons for $1 off a family-size box of cinnamon rolls, you'll save $4 on a single purchase.