New postage rates go into effect tomorrow, May 11. There aren’t any changes to the shipping rules, just increases in prices. You can download an updated U.S. Postal Rates sheet from our Resources page. It’s a handy one-page guide to all the rates for shipping envelopes or packages up to 1 lb., via First Class mail, both within the U.S. and to international addresses.

For those of you who like to geek out on postage, here’s a quick rundown of the changes:

If you need a refresher about shape-based pricing (ex: the difference between a letter and a large envelope), or how to use media mail, check out our Zinester’s Guide to U.S. Mail.

Oh, and by the way, USPS ended its second quarter with a $1.9 billion loss. It has faced net losses from operations in 10 of the last 11 fiscal quarters; this loss is attributed to a decline in mail volume. Read more, or news coverage