Best Self-Seal Envelopes of 2025

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 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 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 Postmaster DL Envelopes are designed to hold A4 sheets folded into thirds, making them perfect for sending documents with a single 1st or 2nd Class stamp. Their opaque blue inner pattern ensures that your documents remain private, giving you peace of mind. The self-seal feature allows for quick and hygienic closure, eliminating the need for licking or peeling. Additionally, these envelopes are made from 80GSM paper and are PEFC-certified for sustainability, ensuring you are making an eco-friendly choice.

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 Wallet Envelopes are designed for ease of use with their self-seal feature, allowing you to securely close each envelope without the need for additional adhesives. These plain white envelopes come in a pack of 1000, making them ideal for bulk mailing needs. Their uncoated paper finish provides a professional look, suitable for any mailing purpose. With such a large quantity available, you can handle multiple tasks without worrying about running out of envelopes anytime soon.

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.

The Indigo C6 Envelopes are a convenient choice for your mailing needs. This pack contains 50 white self-seal envelopes, measuring 114mm x 162mm, making them ideal for invitations, letters, or documents. Their self-seal design means you can quickly secure your items without the need for moisture or additional adhesive, saving you time. With a thickness of 80gsm, these envelopes offer good durability, ensuring your contents remain protected during transit.

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 SmithPackaging Wallet Envelopes are plain white DL (110 x 220 mm) envelopes, perfect for your everyday office posting needs. With a convenient pack of 25, you can easily manage your mailing tasks. The envelopes feature an opaque blue interior for enhanced security, ensuring that your documents remain private. Additionally, the self-seal closure makes sealing your items quick and hassle-free, saving you time during busy workdays. Made from PEFC certified paper, these envelopes are also a sustainable choice.