This beast of a cup holder is just like our practically infamous Party Barge, except that it mounts to a vertical surface. So, attach it to the side of your boat when you're hanging out at the sandbar or stick it to the side of your car when you're tailgating. Holds 2 handle-sized bottles of booze and a mixer, plus five cups, cans or bottles. Attaches with two 6 Inch SeaSucker vacuum mounts (the strongest ones we make). For serious partiers only.