I purchased the universal buddy since I drink Sprite Zero in the bottle (16.9) ounces. The diagram (on the frost buddy bottom) and website indicates it fits 16 ounce bottles. Well it doesn’t fit. It was suggested by Frost Buddy Customer Service to pour out the bottle into the frost buddy which defeats the entire reason for the purchase. To speak nothing of the fact that it was designed for this sole purpose. So now I purchased the XL and I’m guessing it won’t fit in the cup holder of my truck, as indicated on the website. I’m hoping Frost Buddy is wrong again.