I use a 3 ring binder filled with baseball card sleeves. Everything is sectioned off by type of product. The coupons with the nearest expiration date go in front. Everything is handy and I can easily see what coupons I have. This thing goes with me everywhere.
My wife is so embarrased to go shopping with me. It takes me hours to get through a store because I check all the prices to look for freebies and SCREAMING deals.