Yup, Thats the catch. For me it was an easy choice, I already have a basic keggle. So the 5 gal is perfect for the tank...and the 10 for the mashtun. So that came to 78 bucks which qualified me for the discount.
But I have to tell you, since yesterday I've done some additional reading and many people out there are saying "go with a larger conventional box cooler" because if you want to do heavier batches youll have the room and its easier to minipulate the grain bed.
Anyways, thats what some said. I have no direct knowledge, I just statered 3 months ago and have yet to do my first ag.