Best 25 mm Envelopes of 2026

The Blake C4 Envelopes are designed for convenience and efficiency. Featuring a peel and seal closure, these envelopes allow you to securely seal your contents without the need for messy adhesives. Made from high-quality 140gsm paper, they provide a sturdy option for mailing important documents like catalogues and books. The size of 324 x 229 x 25 mm is practical for various uses, ensuring your documents remain protected during transit. With a pack of 125, you’ll have plenty of envelopes ready for your mailing needs.

The Blake C4 Envelopes feature a secure peel and seal closure, which makes them easy to use while providing extra security for your contents. Made from high-quality 130gsm paper, these envelopes ensure durability and a professional look. With a V-bottom gusset, they can accommodate thicker items like books and brochures with ease. The 25 mm capacity is perfect for catalogues, allowing you to send multiple pages without worry.

The Blake C4 Envelopes are perfect for your catalogues, books, brochures, and more. The peel and seal feature allows you to easily secure your items, saving you time and effort. Made from high-quality paper, these envelopes provide durability and a professional appearance. With a gusset pocket design, they offer extra space, accommodating thicker materials without compromising on style or functionality. These envelopes are a practical choice for any mailing needs.

The HSD C4 Expanding Envelopes are high-quality manilla envelopes designed to accommodate A4 documents easily. With an approximate size of 324mm x 229mm and an expanding width of 25mm, they offer ample space for storing multiple papers. Made from 130gsm manilla, these envelopes resist damage during transit, ensuring your documents arrive in perfect condition, while also keeping postage costs low. You'll appreciate the convenience of the peel and seal feature, which allows for quick and secure sealing without the need for additional tools.

The 5 Star C4 Envelopes are designed for convenience and efficiency. With 25mm V-base style gussets, they provide ample space for thicker documents, making them perfect for sending multiple pages. The peel and seal closure allows for quick and secure sealing, saving you time when preparing mail. Each pack contains 125 envelopes, ensuring you have enough for all your mailing needs. Measuring 324x229x25 mm, these envelopes are ideal for standard-sized documents, offering a professional presentation for your correspondence.

The Gusset Envelopes Pack is perfect for storing and sending bulkier items. With a generous gusset size of 25mm, these envelopes can accommodate thicker contents without compromising on quality. The Peel & Seal feature ensures that sealing envelopes is quick and hassle-free, which is particularly useful for larger tasks. Made from 120gsm paper, these envelopes provide added thickness, giving you peace of mind that your items are well-protected during transit. Additionally, they are suitable for overprinting, allowing for personalisation or branding.

The A4 Mailer Envelopes are lightweight yet sturdy, designed for mailing flat items like books, DVDs, and brochures. Their innovative E-flute cardboard allows you to expand the envelope's capacity up to 50mm, accommodating various thicknesses with ease. You will appreciate the convenience of the pre-creased design, which simplifies packing your items securely. With a peel-and-seal strip, these envelopes ensure your contents remain safe during transit, making them a reliable choice for your mailing needs.