Plastic foam was made with 25% amylose corn starch and polystyrene or polymethylmethacrylate. The foam was formed with a commercial extruder at 120°C barrel temperature, 140 rpm screw speed and 6% moisture content. X-ray diffraction analysis indicated grafting between starch and plastics. Shipping bulk density, water solubility index, spring index and compressibility of extruded loose-fills were determined and compared with commercially available polystyrene and starch loose-fills. Loose-fills also were compared with various tests used by the loose-fill packaging industry such as flowability, electrostatic adhesion, loaded bulk density, compressive creep and compressive set. Except for the densities, the properties of the starch-based loose-fills compared favorably with the commercial products.