13 1/2 x 13 1/2 Square Envelopes

JAM Paper 13 1/2 x 13 1/2 square envelopes provide generous space for large cards, artwork, announcements, marketing materials, and other oversized pieces. Their broad dimensions keep substantial flat contents together without requiring a narrow rectangular envelope. This specialized size suits offices, events, creative projects, and professional correspondence.

A classic white surface keeps the focus on the enclosed materials while providing a clean exterior for addressing or labeling. These large white square envelopes suit presentations, corporate materials, formal announcements, and creative work. Their neutral appearance also coordinates easily with printed branding, event stationery, and a wide range of design styles.

Beyond outgoing correspondence, this 13 1/2 inch square size can help separate and organize larger materials by project, client, event, or recipient. Designers can store prints, offices can group paperwork, and marketing teams can keep campaign pieces together before distribution. The oversized dimensions provide added space when standard square envelopes are too small.