I remember someone explaining about freeze-dried food, but I'm still confused. I see a 10-pound bag of Grandma Lucy's costs about the same as a 30-pound bag of Great Life on Amazon. So, does the freeze-dried food puff up when you add water, so a 10-pound bag ends up with as much food as a 20 or 30 pound bag of kibble? Or is it just darned expensive? Tracy