Best Self-Seal Envelopes of 2026

The Blake Self Seal Envelopes are perfect for your everyday office mailings. With their self-seal feature, you can save time and effort, ensuring your documents are securely enclosed without the need for additional adhesives. The security opaque design keeps your contents private, providing peace of mind when sending sensitive information. Additionally, these envelopes come in a convenient pack of 100, allowing you to handle large volumes of mail easily. Their versatile size of 110 x 220 mm makes them suitable for a variety of documents.

The Blake DL Envelopes are designed for your everyday mailing needs. With an easy-to-use self seal closure, you can securely send your letters and documents without fuss. Made from high-quality 80 gsm paper, these envelopes provide a professional feel for all your correspondence. Ideal for business letters, brochures, and more, this handy pack of 50 ensures you always have enough on hand. Plus, the DL size is perfect for A4 sheets folded into thirds, making it a convenient choice for various tasks.

TRIPLE PRIO Peel and Seal Envelopes offer exceptional security with their tinted design, ensuring that your sensitive documents remain confidential. The quick peel and seal closure means you won't need any moisture, making mailing more efficient and hassle-free. With a windowless front, you can easily print, label, or hand-address your envelopes, saving you time during busy mailing tasks. Plus, the printer-friendly thick paper prevents jamming, allowing you to focus on your correspondence without interruptions.

The Blake Self Seal Envelopes are an excellent choice for anyone needing to send invoices, letters, or brochures securely. Their blue opaque printed interior ensures extra security and confidentiality, giving you peace of mind that your important documents remain private. The easy-to-use self-seal closure saves you time and effort, making the process more convenient. With a pack of 1000, you'll have plenty of envelopes on hand for all your mailing needs.

The Postmaster DL Envelopes are designed to securely hold A4 sheets folded into thirds, making them ideal for mailing documents. With their opaque blue interior, you can ensure your sensitive information remains private. The self-seal feature allows for quick and hygienic closure, eliminating the need for licking. Additionally, these envelopes are PEFC-certified, meaning they come from sustainably managed forests, providing peace of mind for environmentally conscious users.

The Blake C5 Envelopes are designed for convenience and ease of use. Featuring a self-seal closure, you can securely seal your letters and documents without the need for additional glue or tape. Made from high-quality 90 gsm paper, these envelopes provide a professional appearance, ideal for business correspondence and brochures. The handy pack of 50 ensures you have plenty on hand for all your mailing needs. Additionally, the C5 size is perfect for A4 sheets folded in half, making it versatile for various uses.

The Blake Self Seal Envelopes are designed for everyday use, measuring 110mm x 220mm, making them perfect for various documents. With a quality weight of 100gsm, these envelopes provide a sturdy option for sending brochures and catalogues. Their self-seal feature ensures that you can securely close them without the need for additional adhesives, saving you time and effort. The attractive blue opaque design adds a touch of professionalism, making your correspondence stand out.

The EPOSGEAR® A6 Envelopes are brand new, high-quality plain white envelopes designed for convenience. Their self-seal function ensures a secure closure, making it easy for you to send letters and invites without the worry of them opening during transit. These envelopes are perfect for sending postcards, photos, and other small documents, whether for personal or business use. With dimensions of 162mm by 114mm, they fit comfortably into your mailing needs.

The Triplast Security Envelopes come in a pack of 100 and are designed for everyday use at home, in the office, or for commercial purposes. They feature a blue high-security pattern on the inside, ensuring that your confidential documents remain concealed during transit or storage. With a hassle-free self-seal adhesive, you can seal the envelopes easily without the need for tape or glue. Additionally, these envelopes are compatible with most inkjet and laser printers, making them practical for all your mailing needs.

The Evour Self Seal Envelopes offer a quick and easy sealing solution with their ultra-strong self-seal adhesive strip, allowing you to close them without any moisture or fuss. Their no window design makes them perfect for clear printing, labelling, or hand-addressing, giving you great flexibility for your mailings. These envelopes are hassle-free and practical since you don’t need tape, glue, or licking; simply fold and press the flap to seal. Additionally, they work well with most inkjet and laser printers, making them convenient for both home and office use.