Large Letter & Postal Boxes (Royal Mail)

With the rise in ecommerce business and companies looking for more presentable solutions than mailing bags or standard cardboard boxes. Our brown postal box is the ideal mailing box for ensuring both durability and professional presentation. This simple yet effective design is very popular and would also benefit from our custom printed logo tape, great for brand recognition and ensuring goods are secure.

Perfect when needing to send a variety of items in a professional box, our brown postal boxes are made from high quality single wall cardboard material. Available in four styles: tuck-in-flaps, fold-in-flaps, ecommerce and peel-&-seal, see ‘images’ and ‘more info’ for style specification. View the product table for exact dimensions or use the search bar to find the brown box closest to your required dimensions.

All our tuck-in-flaps brown postal boxes have branding on the inside flaps, not visible when constructed. They can be used in conjunction with bubble wrap and void fill to secure products inside, or coloured tissue paper for a more presentable solution if you are using our brown postal boxes as gift boxes for letterbox style gifts. Our peel-&-seal postal boxes feature a secure sticky seal as well as a tear open strip.

Our ecommerce boxes can be assembled within seconds thanks to their crash-lock-base and integrated peel-&-seal strip. Follow the links to learn more about our ecommerce boxes and large letter postal boxes. Click here to view more postal boxes.

Lightweight but sturdy, these boxes are great for keeping costs down. All styles of box have a huge range of uses and have proven an extremely popular choice for e-commerce, mailing and fulfilment companies. All sizes in this range are delivered flat-packed, minimising the amount of space required to store them and making them easier to handle. These boxes have a smooth matte kraft finish.

These one-piece cartons are quickly and easily assembled. For a more presentable solution, see our range of white postal boxes.

All our brown postal boxes adhere to Royal Mail’s Pricing in Proportion. To find out if your chosen size of brown postal boxes falls under Royal Mail’s letter, large letter, small parcel, medium parcel or large parcel categories, please refer to the Royal Mail PiP Guide.

We offer volume discounts when buying in bulk, with free delivery on larger online orders.

Are brown postal boxes made from FSC approved sources?
Yes, our brown postal boxes are made from responsibly sourced materials.

Are these brown boxes biodegradable?
Yes, our brown postal boxes are biodegradable.

Are brown boxes recyclable or made with recycled materials?
Our cardboard boxes are made from recycled materials, the percentage of which ranges from 60% to 90%. This cardboard is one of the most easily recycled resources in the UK and can be recycled kerbside by customers.

Seal with one of our paper tapes and fill with environmental void fill for the perfect plastic-free packaging. These single walled boxes are kind to the planet and vegan friendly.

Need more help? We’ve got you. Get in touch with us and a member of our friendly team will be happy to help.