Best Triplast Envelopes of 2025

* We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation.
Triplast envelopes are a reliable and efficient solution for all your mailing needs. Made from high-quality materials, these envelopes provide excellent protection for your documents and ensure they arrive in perfect condition. Available in a range of sizes and styles, Triplast envelopes are designed to meet your specific requirements. With their strong adhesive seal and durable construction, these envelopes are perfect for both personal and professional use. Whether you need to send important business documents or personal letters, Triplast envelopes are a dependable choice.
At a Glance: Our Top Picks
Top 10 Triplast Envelopes
Triplast 500 C6 White Self Seal Envelopes
The Triplast C6 Envelopes are perfect for your mailing needs, providing a pack of 500 fully opaque envelopes that measure 114x162mm. With enhanced security features, the blue high-security pattern ensures your confidential documents remain concealed during transit. The self-seal adhesive allows you to simply fold and press the flap shut, eliminating the hassle of tape or glue. These envelopes are also compatible with most printers, making them ideal for organising invoices and letters in both home and office settings.
Triplast Self Seal Security Envelopes 100 Pack
The Triplast Security Envelopes are designed for convenience and security, making them perfect for everyday use. With a see-through window, you can easily display addresses without opening the envelope. The enhanced security feature includes a blue pattern that obscures contents, ensuring privacy during transit. The self-sealing design allows you to simply fold and press the flap, eliminating the need for tape or glue. Plus, these envelopes are compatible with most printers, making them versatile for mailing invoices, letters, and brochures.
Triplast C4 Manilla Hard Board Envelopes
The Triplast Hard Board Envelopes are essential for anyone needing to send flat documents securely. Designed for A4 and A3 papers, these envelopes will not bend, ensuring your important certificates and reports arrive crease-free. The peel and seal strip makes packing quick and easy, saving you time and providing a secure closure. Additionally, these envelopes are a cost-effective solution, as you can write addresses directly on them, avoiding the need for extra labels.
Triplast C5 Manilla Hard Board Envelopes
Triplast Hard Board Envelopes are a must-have for anyone needing to send or store documents securely. They are designed to hold unfolded A5 sheets or A4 sheets folded in half, making them perfect for greeting cards and photographs. Their robust construction, featuring a 120gsm kraft paper front and a 1000 micron board back, ensures that your contents remain flat and crease-free. The peel & seal strip allows for quick and easy sealing, saving you time during packing. Plus, being lightweight yet sturdy, they offer a cost-effective option for mailing without compromising on quality.
Triplast M4 Size Expandable Packaging Envelopes
The Triplast M4 Envelopes are versatile packaging solutions that transform from flat envelopes to postal boxes, allowing you to customise the depth from 1mm to 70mm. This feature is particularly useful for accommodating various items, ensuring a snug fit. The hassle-free peel and seal strip saves you time and effort during packing, eliminating the need for tape or glue. Moreover, these envelopes are crafted from durable, lightweight cardboard, providing excellent protection for your shipments while keeping postage costs down.
Triplast A5 Printed Document Enclosed Wallets
The Triplast Document Enclosed Wallets are a practical solution for securely attaching important paperwork to your parcels. With an internal size of A5, these wallets feature a clear plastic front that displays the "Documents Enclosed" print, ensuring your documents are easily identifiable. Their self-seal paper back makes it quick and simple to insert your paperwork, saving you time during the packing process. Made from durable, weatherproof materials, these wallets protect your documents from rain and dirt, keeping them safe and legible.
Triplast A5 Clear Document Enclosed Wallets
The Triplast Document Wallets are essential for efficiently attaching important paperwork to various parcels. With an internal size of A5, they are versatile enough to suit different shipping needs, from mailing bags to wooden crates. Their quick and easy design features a clear plastic front and a self-seal paper back, allowing you to insert documents effortlessly. Made from high-grade plastic, these durable wallets protect your documents from rain and dirt, ensuring they remain readable and scannable.
Triplast A6 Clear Document Enclosed Wallets
The Triplast Document Wallets are an essential tool for affixing paperwork to your parcels. With an internal size of A6, these wallets offer a clear plastic front and a self-seal paper back for quick and easy use. You can effortlessly insert documents and attach them to various packages, including mailing bags and wooden crates. Made from durable, weatherproof materials, they ensure that your documents remain readable and protected from rain and dirt. Plus, they are fully recyclable, making them an eco-friendly choice for your shipping needs.
Triplast C3 Manilla Hard Board Envelopes
The Triplast Hard Board Envelopes are an essential mailing solution, designed to hold unfolded A3 papers or A2 papers folded in half. Their sturdy construction, featuring a 120gsm kraft paper front and a 1000 micron board back, ensures that your documents remain flat and crease-free during transit. With a built-in peel and seal strip, sealing your envelopes is quick and hassle-free, saving you time and effort. Plus, these envelopes are a cost-effective option for postage, allowing you to write addresses directly on the surface without needing additional labels.
Triplast A4 Documents Enclosed Wallets, Pack of 100
Triplast Documents Enclosed Wallets are designed to make sending parcels easier and more organised. With a clear plastic front and self-seal back, you can quickly insert important documents like invoices or packing lists. These wallets are versatile, allowing you to attach them securely to various types of parcels, from mailing bags to wooden crates. Made from durable, weatherproof materials, they protect your documents from rain and dirt, ensuring they remain readable and scannable throughout their journey.
During our Triplast envelope research, we found 18 Triplast envelope products and shortlisted 10 quality products. We collected and analyzed 43,825 customer reviews through our big data system to write the Triplast envelopes list. We found that most customers choose Triplast envelopes with an average price of £8.53.
The Triplast envelopes are available for purchase. The top 10 picks range in price from a low of £3.00 to a high of £16.00, find the one that fits your budget. The seller of top 1 product has received honest feedback from 1,206 consumers with an average rating of 4.8.

Jordan Akthar owns one stationery store in Bradford, and another in Derby. He started with a corner bookshop, and now the rest is history. He is often found in his stores taking count of inventories of books and stationery. Jordan also likes to write, and this drove his passion for writing articles on stationery maintenance. He owns a blog, where in his free time, he would write DIY tips on how you can recycle and refine your stationeries.