Any one ever notice that not all 5 gal carboys are the same size? I have about 15 of them. With some I get 24 bottles and others I get 25 - 26 bottles. Any way to thell the difference? The problem that I have is when I rack from one to the other. If I rack from a slightly smaller one to a larger one I end up with a topping problem. I recently started using a lable maker to indicate the size to try to aleviate the problem.