Square envelopes are definitely unique!  

CutCardStock makes your DIY note card or invitation affordable with these Cougar natural 6.5 inch square envelopes that bring a soft, natural look to your project.  Available in a vellum finish that is smooth, but not slick, these off white envelopes have a neutral off-white undertone that is a perfect match for numerous colors.  

These unique envelopes will hold an insert size up to 6.25 x 6.25 inches. 

NOTE:  please check the USPSwebsite for extra postage charges on square envelopes.