Ship to multiple addresses
500 products available for next day delivery
Over 1,000 products available
12pm cut-off for next day delivery
Free delivery over £150 ex VAT
Eco-friendly options across the range
UK stock for fast delivery
Ship to multiple addresses
500 products available for next day delivery
Over 1,000 products available
12pm cut-off for next day delivery
Free delivery over £150 ex VAT
Eco-friendly options across the range
UK stock for fast delivery
First time buyer? Use code
PACK10 at checkout for 10% off!
Cardboard Envelopes - Secure and Protective Mailers for Safe Shipments
Cardboard Envelopes are the perfect solution for securely mailing important documents, certificates, photos, and other flat items. Designed to provide superior protection against bending, creasing, and other potential damage during transit, these envelopes are made from sturdy, rigid board material. Available in a variety of sizes, our cardboard envelopes are ideal for businesses that need to send documents securely while maintaining a professional appearance. Whether you're an online retailer, a government office, or a legal firm, cardboard envelopes are the ideal choice for your document shipping needs.
Send photos, certificates, artwork and slim merchandise with rigid cardboard envelopes and capacity pocket envelopes that protect against bends and scuffs while keeping postage efficient.
Packing non-flat kits or mixed items? See ColomPac Fast Assembly Boxes for instant-bottom speed and a self-seal finish.
What are cardboard envelopes?
Rigid or micro-fluted corrugated mailers designed to keep flat contents crease-free. Options include stay-flat all-board envelopes and capacity pocket envelopes that expand to hold small books, brochures and catalogues.
Why choose ours
Self-seal closures for quick packing, often with tear strips for tidy opening.
Edge protection to help prevent corner damage in transit.
Recyclable paper-based construction for simpler end-of-life.
Ideal uses
Documents & certificates: keep critical paperwork flat and professional.
Photo prints & artwork: use a cardboard sheet insert for extra rigidity.
Slim accessories & merch: small textiles, stationery, brand kits.
Stay-flat all-board envelopes keep single items rigid with 0 mm capacity. Capacity pocket envelopes expand (typically 0–50 mm) to hold thicker contents like small books or brochures.
Yes—use all-board or add a cardboard sheet insert for extra stiffness, and pack prints face-to-face with tissue.
Many capacity C5/C4 variants are designed around Large Letter sizing (check depth/weight). See product detail pages for guidance.
Why Choose Our Cardboard Envelopes?
Durable Protection: Made from high-quality, rigid cardboard, these envelopes protect your items from bending, folding, or any other type of damage during transit, ensuring that your documents or artwork arrive safely.
Eco-Friendly: Our cardboard envelopes are made from recyclable materials, making them an environmentally friendly packaging option. They are fully recyclable after use, helping reduce waste and minimize environmental impact.
Professional Appearance: These envelopes not only offer protection but also create a sleek and professional look for your shipments. Their clean, minimal design helps your documents stand out while maintaining a premium image for your business.
Cost-Effective: Cardboard envelopes provide a cost-effective solution for shipping flat items. The sturdy construction ensures reliable protection while being affordable, making them a great choice for businesses looking to reduce packaging costs.
Easy to Use: These envelopes are simple to assemble, and require no additional tape or glue for sealing. Simply insert your documents and fold the flap over to securely seal the envelope.
Available in Various Sizes: We offer cardboard envelopes in a variety of sizes to meet the needs of different items, from small documents to larger prints. Choose the right size for your shipments to ensure optimal protection and efficiency.
Shop Cardboard Envelopes in Various Sizes
A4 Cardboard Envelopes – Ideal for documents, certificates, and photos. A popular size for businesses sending letters or flat packages.
A5 Cardboard Envelopes – Suitable for smaller items such as flyers, postcards, and smaller artwork. Compact and lightweight for easy shipping.
A3 Cardboard Envelopes – Designed for larger documents or prints. Provides ample space for oversized paper, posters, or blueprints.
Custom Cardboard Envelopes – We offer custom-sized cardboard envelopes for businesses with specific packaging needs. Contact us for more details on custom orders.
Single Wall Boxes - FAQs and More
Why Cardboard Envelopes Are the Right Choice
Cardboard envelopes offer a secure and cost-effective way to ship flat items such as documents, photos, and certificates. They provide excellent protection against damage during transit, while also offering a professional and premium appearance. Made from high-quality, recyclable cardboard, these envelopes are an eco-friendly packaging solution for businesses that want to reduce their environmental impact. Whether you need to send important legal documents, sensitive paperwork, or valuable prints, our cardboard envelopes offer the protection and reliability you need for your shipments.
Frequently Asked Questions About Cardboard Envelopes
Cardboard envelopes are made from high-quality, rigid cardboard material, providing excellent protection for your items during shipping. The sturdy construction prevents bending and creasing, ensuring that your documents or artwork arrive intact.
Yes, our cardboard envelopes are made from recyclable materials, making them an environmentally friendly packaging option. After use, they can be recycled, helping reduce waste and contributing to sustainability efforts.
We offer cardboard envelopes in various sizes, including A4, A5, and A3. We can also provide custom sizes for businesses with specific packaging needs. Contact us for more details on custom orders.
Yes, cardboard envelopes provide excellent protection for fragile items such as certificates, photos, and artwork. For added protection, we recommend using additional packaging materials like bubble wrap or foam inserts inside the envelope.
Yes, cardboard envelopes are suitable for both domestic and international shipping. They provide reliable protection for your items during transit, meeting postal requirements for various destinations worldwide.
Yes, we offer custom cardboard envelopes tailored to your specific needs. You can also add custom printing, such as your company logo or other branding. Contact us for more information on custom orders and printing options.
Cardboard envelopes are easy to assemble. They are supplied flat and can be quickly folded along the pre-scored lines. No tape or glue is required—simply fold the flaps and secure the envelope for use.
Cardboard envelopes are designed for lightweight to medium-weight items. For extremely heavy items, we recommend using padded envelopes or boxes for added protection and support.
