I have bought and sold several mouthpieces over the past month and EVERY SINGLE TIME I use USPS 2nd day air, the package stalls for several days and arrives several days late. What a waste of money. By contrast, every time I use UPS the package arrives on time and remarkably fast. I shipped a mouthpiece from Chicago to Wisconsin via UPS and I brought it to UPS at 4 pm and it arrived at the buyer’s address the very next day. Twice this month UPS has delivered packages out of state by the very next day. USPS would have promised the delivery in 3 days and actually taken 6 business days. I am so done with USPS.