6 1/2 Square Invitation Envelope - 60# Natural (6.5 x 6.5) - Square Announcement Series (Box of 250) A Quantity of 250 - 6 1/2 SQ Invitation Envelope - Natural 28# Cougar Natural Paper - Regular Gummed Flap. The outside dimension of this envelope is 6 1/2 x 6 1/2. This envelope is meant for invitations or inserts that are 6 x 6 or smaller. Great as wedding envelopes. Use for greeting cards, invitations, announcements, save the dates, letters, photos, postcards, and more. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground