Now even the heaviest packages can withstand rough handling. Our 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.