The Big Dig can be used in any size sandbox. While The Big Dig can dig to a total depth of 15", it can be used and enjoyed in as little as 3" of sand. The Big Dig can also reach 33" when the boom and stick (arm) are completely extended. If you have a standard 4' x 4' sandbox, a common method used by children is to set up The Big Dig outside of the sandbox and Dig In! Do you already have a sandbox or are you looking to get a new one? Use the calculator below to see how many bags of playsand you'll need to get digging.