Invitation envelopes - 6x6 does it all A square envelope is a terrific way to set your special occasion invitations apart from the rest of your recipients' mail. Our sizes range from the cozy 5x5 to our large 6x6 invitation envelopes to 6.5-inch squares, in half-inch size increments. Of course, our square invitation envelopes - 6x6 is one of our most popular squared sizes - can be used for a variety of mailing projects, not just as wedding invitation envelopes. Stack a few blank compact discs - separated with paper to prevent scratching - into 6x6 invitation envelopes, and use them to store or mail CDs. Another option is to line an envelope with cardboard or place an entire CD, case and all, into the small package for shipment. While cushioned packing materials are still recommended for hot climate shipping or cross-country mailings, this is an inexpensive alternative to buying bubble-wrap mailers for large-scale, mass mailings to nearby destinations. Consult with CutCardStock.com for recommendations on envelope styles and designs for your mailing. Our 6x6 invitation envelopes get attention Our square invitation envelopes, 6x6 inches down to 5x5 inches in size, are popular, distinctive and eye-catching. Because most correspondence arrives in a rectangular format, a square envelope immediately captures the attention of your recipient, ensuring that your message will be read and absorbed. CutCardStock.com's square sizes come in 5-inch, 5.5-inch, 6-inch and 6.5-inch measurements. Our 6x6 invitation envelopes color choices include black, natural (also known as ivory) and white. Browse our site for a color, weight and style of paper or cardstock to go along with your envelope selection. With CutCardStock.com's help, you can customize blank invitations to further grab the attention of your recipient.