The perfect box for letterbox-sized parcels. Smaller products can be shipped more cost-effectively and conveniently in these boxes. Below, you’ll find a range of flat mailing boxes. Filter for Surplus or Re-used boxes to find the more affordable and sustainable options.
Flat mailing boxes are specially designed to fit through a standard mailbox slot. This makes them ideal for sending small items via postal services. They’re popular with e-commerce and retail businesses because they offer an easy, cost-effective way to ship items like books, jewellery, clothing, and other small products. One major advantage is that they often qualify for lower letterbox-parcel rates with carriers.
Your products will only be delivered through the letterbox if they meet the following dimensions.
In The Netherlands
In Germany
The maximum dimensions are important, but so is what you put inside. Choose a box size that closely matches the contents so items don’t shift and get damaged during transit.
Strength is key, especially when shipping fragile products. Make sure the box is sturdy enough to prevent damage. Choose between single-wall or double-wall corrugated cardboard.
More and more businesses are choosing Surplus and Re-used boxes. While we highlight these mainly for their sustainability benefits, most buyers choose them because they are significantly more cost-effective. Looking for an affordable letterbox shipping box? Use the filter on this page. View alle mailing boxes.
When buying a flat mailing box, you can also consider the color. White, brown, and colored boxes are available. A colored box can stand out in the mailbox and catch the recipient’s attention. Want even more impact? Printing is also an option. Need a printed box? Request a quote via the product page.
Did you know that the new, unprinted Surplus boxes we keep in stock can also be custom printed? A printed flat mailing box is a great way to showcase your brand and engage the recipient. Find the box you want and click “Request a quote” on the product page to share your requirements.
Flat mailing boxes are available in standard A-sizes, such as A4, A5, and A6. The maximum height is 28 mm. Below is an overview of minimum lengths and widths, these are the A-sizes with roughly 5 mm extra. You can always choose slightly larger if needed.
Need a bigger box? Enter your desired dimensions below to see what’s in stock.
