usps package size

How closely does USPS monitor package size? - The eBay ...- usps package size ,Feb 18, 2014·How closely does USPS monitor package size? How closely does USPS monitor package size? Feb 18, 2014 5:17:49 PM. On my seller account, I am shipping an item that must use a box measuring 24 x 18.25 x 11.5 Weighs 11 pounds . If I use size of 24 x 19 x 12, it will cost $20.50 . If I use size of 24 x 18 x 12, it will cost $15.50 ...USPS.com® - USPS Tracking®Service / Sample Number. USPS Tracking ® 9400 1000 0000 0000 0000 00. Priority Mail ® 9205 5000 0000 0000 0000 00. Certified Mail ® 9407 3000 0000 0000 0000 00. Collect On Delivery Hold For Pickup 9303 3000 0000 0000 0000 00. Global Express Guaranteed ® 82 000 000 00