I shipped out a case today to California in a 50 x 20 x 8 guitar box. I had the price figured out to just around $31 standard post. The woman behind the counter does her measurements and plugs them in. Price comes up as $97. Shocked, I ask her how could it be that much? She says the box is 51 inches long, putting me 1 inch over the acceptable 108 inches. I tell her it is a standard box and I have never had this issue before. She brings our her tape and measures it to be 50 1/2 or 50 3/8ths based on your perspective. She tells me I have to cut the box down to less than 50 inches or pay an additional $66 in shipping. I take out my pocket knife and cut the box down as best I can. I go back to the counter and as if I can have a bit of tape to reseal the box. She says that tape is only for Priority customers and I will have to buy a roll for $3.49. I buy the roll. Tape the box and ship it out. All over a fraction of an inch that one could dispute should have been rounded down. I know they can be the most cost effective way to ship, but with the condition that some of my packages have arrived in and the attitude of some of the counter staff I'm almost ready to give up on USPS. Anyone else had frustrating run ins with them?