Scotch Heavy Duty Shipping Packaging Tape holds strong on all box types, including 100% recycled boxes. It's even guaranteed to stay sealed. The strong, tough, solvent free hot melt adhesive locks in your heavy duty contents and locks out everything else. You don't need layers of tape to get the job done - just one strip at a time so you save time. Your heavy packages can bear the weight and stay sealed through it all with Scotch Heavy Duty packaging tape.