Impeller packer is recommended for packing a range of ground rock-type products. A continuously running impeller feeds the product, through a cut-off valve gate and a flexible connection, to the filling spout and into the sack. A saddle on a weigh beam supports this, and once the correct weight is obtained, the cut-off gate is actuated and the sack discharged. Impeller packers are available with weighing based on load cell controls. They are also supplied with upto 4 spout high-speed packing of cement and products. For low outputs, a simple packer is available in which the spout and chair assembly is on a platform scale, the cut-off gate being manually controlled.