Filament tape or strapping tape is a pressure-sensitive tape used for several packaging functions such as closing corrugated fiberboard boxes, reinforcing packages, bundling items, pallet unitizing, etc.

It consists of a pressure-sensitive adhesive coated onto a backing material which is usually a polypropylene or polyester film and fiberglass filaments embedded to add high tensile strength.

The tape is most often used as a closure for corrugated boxes such as a full overlap box, five panel folder, full telescope box. "L" shaped clips or strips are applied over the overlapping flap, extending 50 - 75 mm (2 - 3 inches) onto the box panels.

Heavy loads or weak box construction may also be aided by the application of strips or bands of filament tape to the box.