Despite the fact that fast food cups have been designed to fit in holders, bottles of beverages still are either too small and slide about and fling out, or don't fit at all. Take Powerade (made by Coke). Its got a huge top and huge bottom with a grooved neck to hold onto when you're dripping sweat. Barely crams into my holder and the first highway ramp thats curved its in the passenger seat. Ugh.