7 1/2 Square Invitation Envelope - 24# Smooth White (7.5 x 7.5) - Announcement Envelope Series (Pkg of 100) A Quantity of 100 - 7 1/2 SQ Invitation Envelope - 28# White 28# White Wove Paper - Regular Gummed Flap. The outside dimension of this envelope is 7 1/2 x 7 1/2. This envelope is meant for invitations or inserts that are 7 x 7 or smaller. Great for weddings, anniversaries, birthdays, corporate events, graduations, announcements, and more. This envelope may be sourced from any one of a number of top brands. Ships via Priority Mail