Panera Bread Lemonade

This Lemonade has real citrus pulp. I note that it does not say lemon pulp. Further, I noted that this is 320 Calories  for whatever they call a serving and Sierra Mist is only 240 at Panera Bread. This is sweet and artificial. 

A 12oz can of Sierra Mist is only 120 calories and  so it looks like they mean  24oz, but I don't think they sell that size. So confused.