Check out SeaSucker's Fisherman's Cup Holder. You get the vertical mount format for your drinks with the addition of a mini tackle- rigging station. It can hold things like pliers, knives, hooks, lures and whatever other small items you might need. The center round spot has a 2.75 inch diameter. With the SeaSucker vacuum mount, this can attach to your cooler when your sitting by the side of a river dropping a line. When not fishing, you still have a very usable cup holder- which you can get with or without the tumbler adapter. For the fishing enthuiast, you will not regret purchasing the SeaSucker Fisherman's Cup Holder!