A Sleight box was an otherwise ordinary-looking rectangular green duraplast crate used for smuggling, with a low-power repulsorlift coil matrix and power-supply built into the casing that would neutralize the contents' weight and lighten the load. The deception could hide anything from thermal detonators and blasters to simply air from customs officials, but by the Galactic Civil War most customs-droids knew what to look for in countering the smuggler design.