Flat rate envelope. This works for individual glasses, shot glasses and some small plates as well Shipped 30 or so mugs and cups in the last year and have had no problems or damage (fingers crossed to not jinx myself now). First, I wrap the mug in bubble wrap and then I wrap that in cardboard and tape the ends down tight. Take that cardboard "cylinder" and stuff into a flat rate envelope, point of the handle first. Then remove the adhesive strip backing on the flat rate envelope and roll the envelope onto itself - into basically a cylinder. Fold in the sharp edges of the top and make sure the adhesive has grabbed as much cardboard as possible. Then put a long strip of tape around the middle and over the ends (to prevent the envelope from splitting if it gets wet or mishandled) and then tape your address label on it. Advertise as PMail Flat Rate envelope and charge $5.85 or $6 (or start at an acceptable margin with free shipping. I pay about $.99 for good mugs at goodwill and start my auctions at $9 or $10 with free PMail. If you are a power seller or top rated, the usps discount will cover your time and bubble wrap costs. Remember, if it fits, it ships.