A Mobile Half-Frame Bulk Bag Unloader with multi-purpose hopper from Flexicon Corp. allows material to be discharged from bulk bags, manually dumped from sacks, and conveyed to downstream processes and storage vessels dust-free. The system minimizes weight for in-plant mobility and achieves a low center of gravity by eliminating upper frame components. A forklift or plant hoist suspends the bag above the unit during operation instead. The high-integrity seal between the bag spout and clamp ring allows full-open discharge from bag spouts of all popular diameters. An integral Bag-Vac dust collector creates negative pressure within the dust-tight system to collapse empty bags prior to retying and disconnection, eliminating dust emitted during manual flattening of empty bags.