An adjustable table assembly for use in a filler assembly includes a table having a top surface configured to receive a flexible container thereon and a clamp disposed on the table and configured to releasably secure the flexible container to the table. The table has an infeed end and an outfeed end opposite the infeed end. The table is movable along a plurality of rails affixed to the filler assembly. The table is movable between a loading position, in which the table is configured to receive the flexible container, and an operating position, in which the table is inside the filler assembly. The movement of the table along the plurality of rails is along a first axis. Filler assemblies and methods of using adjustable table assemblies are also disclosed.