EDiM 13 - The last thing you bought

You know when you run out of something, so you go to the store to pick it up, and halfway home you realize that those two bags of groceries in the trunk contain everything BUT the thing you went to the store to get in the first place? Well, I stopped by 7-11 on the way home and I bought this.

 

Anybody see the problem here? Almost gone already. Now I have to go back for more. Hope I remember what I went for when I get there. Arrgh!