When ordering my invites, I knew the postage for a square envelope would be more. I was okay with the extra cost.
Doing what I thought was my research, usps.com says the minimum size for a square envelope is 5x5. My envelopes are 6.5x6.5. Although the maximum height for a "letter" is 6.125", I thought my invites would count as a large envelope at $0.88 with a $0.20 surcharge for the non-machinable.
I had ordered stamps and was ready to go.
Nope, that doesn't apply to large envelopes and my <1 oz invitation counts as a "package". Therefore, my package of an invitation costs $1.22 to mail.
I know it's only $0.14 more per invite, it's just frustrating when I had stamps and everything.
Argh!!! Thanks for letting me vent!