I began using these shipping labels because the ones I use to use (1.5 x 2.5 - normal mailing labels) must have been to small for postal workers to see. They continued to misroute my Priority Mail to places unbeknown to me. A 2-3 day package usually took 5-12 days! These bigger labels seem to work. So far the 3 packages I mailed went straight to were they were supposed to and not on a side adventure.