Best Gusset Envelopes of 2026

The Q-Connect Envelopes are practical pocket envelopes designed for everyday use. With a 25 mm gusset, they are perfect for accommodating thicker documents without worry. Made from heavyweight 120 gsm paper, these envelopes provide durability and protection for your important papers. The easy peel and seal closure ensures a secure seal, saving you time and hassle when preparing items for mailing. Measuring at C4 size (324 x 229 mm), they are ideal for A4 documents, making them a versatile choice for your office needs.

Manilla C4 Gusset Envelopes are designed for those needing a strong and durable mailing solution. Made from heavy-duty 120gsm material, they provide excellent strength, ensuring your items stay protected during transit. The expanding sides allow you to fit bulkier items than standard envelopes, making them perfect for posting various documents or even clothing. With a convenient Peel & Seal strip, you can quickly and securely seal your envelopes without the hassle of adhesive residue, saving you time and effort.

The Q-Connect C4 Envelopes are designed for mailing bulky items like catalogues and brochures. With a generous 25mm gusset, you can easily fit larger documents without worrying about damage. Made from durable 120gsm paper, these envelopes ensure your contents are well protected during transit. The convenient address window allows for easy labelling, saving you time on addressing. Additionally, the peel and seal closure provides a strong, secure seal, giving you peace of mind that your items will stay safe.

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 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 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 Q-Connect Manilla Envelopes are practical for your mailing needs. With a generous 25mm gusset, these envelopes can accommodate thicker documents, ensuring you can send multiple sheets without worry. Made from heavyweight 120gsm paper, they provide durability and protection for your contents. The convenient peel and seal closure allows for quick sealing, saving you time when preparing mail. Measuring 381 x 254mm, these envelopes are spacious enough for various items, making them a versatile choice for both personal and professional use.

The Herlitz Peel and Seal Envelopes are a good choice for those needing reliable mailing solutions. With their high-quality construction, you can trust that your documents will be well protected during transit. Their ease of use ensures that you can quickly prepare your mail without any fuss. Plus, these envelopes offer excellent value for money, making them a smart option for both personal and professional use. You will certainly appreciate the convenience they provide in your mailing tasks.

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.