Popular Square envelopes are offered at CutCardStock in a wide variety of colors and sizes. If square discount envelopes are what you are looking for to enclose your Invitations, Announcements, DIY Cards or CD's, here are some helpful hints concerning square envelopes:
Enclosure size must be at least 1/4" of smaller in size than your envelope. A 6 inch square invitation should be mailed in a 6.5" x 6.5" Square envelope.
There may be an extra charge for mailing square envelopes. Count the costs by checking out the USPS mailing regulations.