Now even the heaviest packages can withstand rough handling. Scotch Heavy Duty Shipping Packaging Tape seals seams with one strip and keeps boxes closed. It is available in multiple sizes. Resists slivering, splitting and tearing. Seals seams with one strip and keeps boxes closed. Made in the USA with globally sourced materials. Meets USPS regulations for standard packages 20 times the strength of acrylic tapes (in sheer adhesion holding power, compared to acrylic tapes based on ASTM D3654).