It is always a good idea to know what the wording on the coupon means.
One Coupon per Purchase
If you buy one bottle of shampoo, you can use one manufacturer’s coupon for that bottle. If you want to use another coupon for the same item you must purchase another item. You are not allowed to use two manufacturer’s coupon per item. So if you had 10 coupons and 10 coupons, this is allowed. You can combine (1) manufacturer’s coupon and (1) store coupon for the same item.
One Coupon per Item Purchased
This means the same as one coupon per purchase.
One Coupon per Transaction
You are only allowed one coupon for this item for each transaction. This means if you buy two or more of the same item you can only use one coupon for that product.