I don't know about Pepsi, because I'm a "Coke fiend"

, but on the 12-packs and cases of Coke that I buy there is a code number inside the box. (On the 12-packs, the code will be on the piece of the box that you would pull off the end to make it a "fridge pack". So, be careful!! lol) On the cases, you'll just have to open the box to find it. There are also codes to be found on the underside of the lids of 12oz. bottles of Coke. I'm assuming this is all similiar to what Pepsi does.
As for the Coke codes, you can go here:
My Coke Rewards to register and begin entering codes that you could eventually turn in for prizes, magazine subs, movie tickets, electronics/games, Coke memorabilia (shirts, hats, flip flops, etc.), and other things. You'd have to check the site, because I think they do change every so often. My points rolled over with the new year, but I'm not sure if they will do this next year too, or not.
But these are the "points" that members are talking about, and are wanting to trade for. And the codes can be found on MOST - if not all - Coke or Pepsi products. For instance, Coke also makes Fresca, Mr. Pibb, Vault, Desani water, Powerade, Barq's, Nestea, Minute Maid and Sprite!! Look for codes on these products!!
So....if you drink Coke or Pepsi products, and don't want the codes, there are a whole lot of us that do!!
HTH!!