Scott is spot on about the shipping contract also (and weights) 5.01 pounds is charged at a higher weight. A mis-cut or improperly taped box stamped 20x10x10 that will actually measure .001 over is charged at the next increment. These companies have governmental agencies up the yin-yang verifying their scales and measuring equipment...I can assure you, NO busy clerk is paid to screw over a customer by adding a bit here and there....they don't have the time nor concern, nor motive to do that. I have had my packages audited and occasionally got upcharged, but since I gave myself a 3 ounce error margin on average weight, I never disputed putting in too much water or dry ice. Also, occasionally my boxes would bulge, exceeding the size listed and when passing through their lasers, it would get upcharged.
Size and weight is CRITICAL for these shipping companies, they demand accuracy for loading reasons and aircraft balancing, NOT to screw the little guy!
