5 3/4 x 5 3/4 Square Envelopes

For invitations, thank-you notes, greeting cards, and announcements, this square size provides a balanced fit for a range of stationery. The 5 3/4 x 5 3/4 inch size works well for personal celebrations, seasonal mailings, and professional correspondence. JAM Paper offers multiple styles suited for both everyday projects and more formal occasions.

Color and texture give each envelope style a distinct look. The assortment includes clean white and natural tones alongside navy blue, red, silver metallic, and gold metallic, while linen and kraft-inspired papers add further variety. These finishes make it easy to coordinate envelopes with printed inserts, event colors, or branded stationery.

When larger quantities need to be prepared, Peel & Seal closures help simplify assembly for invitations, client correspondence, announcements, and other card mailings. The square dimensions also give businesses and event planners an alternative to standard rectangular stationery. These envelopes can be used for branded inserts, promotional pieces, RSVP materials, and coordinated event mail.