This 4-cup holder also includes a SeaSucker’s Large Dry Box, which fits snugly into a slot in between the cup holders, giving you waterproof storage for several people's wallets, cell phones, keys, cameras, etc. Attaches to horizontal surfaces like your console top or a table top and held in place by one 4 1/2" SeaSucker vacuum mount. Box size: 7.5"x3.5"x3.5" (approx). Approx. overall dimensions: 19" x 10".