A device for supporting ducts includes a strap that may be adjustably connected to a support. A cradle is carried by the strap. The cradle is adapted to rest against a flexible duct to prevent the duct from buckling over the strap. The cradle is slidably adjusted on the strap. A buckle may be provided to allow the strap to be looped over a support. Two cradles may be slidably mounted on a single strap when a larger diameter duct is supported by the device.