Abstract: A strapping machine applies a strap diagonally across a load. The machine draws a drape of strap material at a lower edge on the front of the load to an upper edge on a rear of the load, tensions the strap material and seals abutting courses of the material to one another around the load and forms a subsequent drape of strapping material. A carriage is movable longitudinally relative to the load. Opposing reciprocating sealing heads are mounted to the carriage and move toward and away from one another. The heads are movable vertically between a position above the upper edge of the load and a position at about the upper edge of the load. A strap supply and a strap lifter is associated with each of the sealing heads. The lifters lower the drape of strap material to the lower edge of the load, and raise the drape of strap material as the carriage moves relative to the load, such that the drape of strap material is drawn toward the upper edge of the opposite side of the load.