Certainly this is very strong tape.  No doubt about that.  But.  . from my experience.  . it really doesn't stick very well.  Though it looks like it's stuck to the box. . . it comes right up if you pull on the edge.  I send a lot of packages to soldiers in Afghanistan.  In the past I purchased Tartan brand tape on Amazon and was very happy with it.  No, it's not nearly as strong, but it sticks well, and I always make sure I once along the seam, and then twice across the seam (like an "H") no matter what type of tape I'm using, and I've never had a problem.