I just decided to sell off a bunch of my CDs. I’ve sold a lot of them last year, and decided to cut through my collection again. I put them on Craigslist, found a buyer and he asked if I could ship to him via USPS Media Mail. Media Mail is slower, but less expensive shipping, especially for heavier items like CDs (only certifiable media related items, like CDs, qualify for Media Mail). Anyway, to estimate the shipping cost for my buyer, and to make sure the package would qualify, I looked up the guidelines for Media Mail on the USPS website.
The last bullet point under “Rules and Restrictions” is that the maximum length and girth of a Media Mail package is 108 inches.