The Flexicon system weighs bulk materials discharged from bulk bags and/or manually dumped from sacks, boxes and other containers, then empties the batch into mobile storage bins. The sanitary system consists of a bulk bag unloading frame, two hoppers and two flexible screw conveyors that feed a central gain-in-weight hopper under automated control. A programmable controller with manual start button activates either of the flexible screw conveyors to load the first ingredient into the central weigh hopper at maximum feed rate. Load cells supporting the hopper transmit weight gain information to the controller that steps down the feed rate to dribble prior to reaching the target weight. In the same manner, the controller starts and stops the second conveyor to load the second ingredient into the weigh hopper and then activates the hopper‘s slide gate valve to discharge the batch into mobile storage bins. The floor hopper is available with a containment hood including integral dust collection for clean, safe handling of dusty materials.