BottlePro was designed for bottles that are approximately 3.5″ to 3.8″ across and have straight-vertical walls. This includes but not limited to: Hydro Flasks (32/40 Ounce), Nalgenes (32/48 Ounce), YETI Rambler Bottles (36 Ounce only), Klean Kanteens (32/40 Ounce), and many other large bottles. BottlePro does NOT work well with tumbler-style bottles that get smaller towards the bottom, …