This Scotch product is perfect for sealing packages.  It is very strong and sticks very well.  I have used it to seal packages for mailing and items I've boxed up at home.  Being clear is a great advantage.  I use it to waterproof address labels on packages by covering the label with the tape.  Not only does this waterproof the label, but it guarantees the label will not fall off.  Highly recommended product.