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Long and flat postal boxes

Protect awkward shapes in transit with our easy-seal long and flat postal boxes

Our unique range of flat and long postal boxes are strong enough to protect delicate or over-sized products in the post and don’t require tape or glue. Our durable flat boxes are ideal for items that are less than 50mm thick and resist knocks and scrapes in transit. For added convenience, our range of small and large flat postal boxes are also easy to stack and are simple to assemble. The self-seal pad or strip also makes it quick to fasten while eliminating the need for extra strapping or adhesives.

If you’re looking to ship longer items, like rolled products or lengthy components, then choosing to buy long postal boxes is the ideal packaging solution. For your everyday posting, our single-use standard postal boxes are a great choice as you securely seal them with the self-adhesive strip. Or if you’re looking to improve on customer satisfaction, our premium postal boxes can be easily opened and re-closed, which makes them perfect for long-term storage.

Available in a variety of sizes, you can choose the right box to suit your postage and packaging needs. Looking for your basic packaging? Then our flat brown postal boxes will reliably get the job done, ensuring your products get from A to B safely. If you’re looking for a more professional and clean finish, then our flat white postal boxes are a perfect alternative and are perfect for printing your logo or an image on.

Make your business Eco-responsible

Making your packaging eco-friendly can be an important factor towards helping your business adhere to environmental standards. All our cardboard boxes are made from at least 70% recycled materials and are 100& recyclable. For more information, have a look at our environmental FAQs. Or if you want to know how you can help protect the environment, read our guide on what to do with cardboard boxes once you’re finished with them.

You can count on us!

If you’re sending products from an e-commerce shop, a retail store, or directly from the warehouse, our long and flat postal boxes are perfect for sending out all of your flat items quickly and with minimal effort. Ideal for saving your post room time during peak periods. If you’re looking to stock up on postal boxes that conform to Royal Mail sizes, then get in touch with our packaging specialists by calling 0800 542 44 28 to discuss.

12 products available
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Up to 25 % OFF Unavailable
Flat brown postal boxes
Price saver
Flat brown postal boxes
13 references
From  £0.29ex. VAT
Up to 25 % OFF Unavailable
Flat white postal boxes
Price saver
Flat white postal boxes
10 references
From  £0.38ex. VAT
Up to 25 % OFF Unavailable
Flat brown postal boxes with an adhesive strip
Flat brown postal boxes with an adhesive strip
3 references
From  £0.44ex. VAT
Up to 20 % OFF Unavailable
Long brown postal boxes
Long brown postal boxes
4 references
From  £0.81ex. VAT
Up to 25 % OFF Unavailable
Flat white postal boxes with an adhesive strip
Flat white postal boxes with an adhesive strip
3 references
From  £0.47ex. VAT
Up to 20 % OFF Unavailable
Extra-large, panel wrap cardboard mailers
Extra-large, panel wrap cardboard mailers
3 references
From  £0.71ex. VAT
Up to 25 % OFF Unavailable
Extra flat brown postal boxes
New products
Extra flat brown postal boxes
6 references
From  £0.22ex. VAT
Up to 30 % OFF Unavailable
Extra flat boxes with top opening and adhesive strip
Extra flat boxes with top opening and adhesive strip
3 references
From  £0.44ex. VAT
Up to 25 % OFF Unavailable
Extra flat brown postal boxes with an adhesive strip
New products
Extra flat brown postal boxes with an adhesive strip
5 references
From  £0.28ex. VAT
Up to 25 % OFF Unavailable
Extra flat white postal boxes
Extra flat white postal boxes
4 references
From  £0.26ex. VAT
Up to 15 % OFF Unavailable
Extra flat box with top opening
Extra flat box with top opening
1 reference
From  £0.74ex. VAT
Up to 30 % OFF Unavailable
Envelope Mailing Boxes
Envelope Mailing Boxes
2 references
From  £0.26ex. VAT