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The Range£13.60Visit shop Storm Trading Group 50 Brown C5 Royal Mail Large Letter Postal Boxes Corrugated Mailing Boxes - Brown
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The Storm Trading Group C4 Royal Mail Large Letter Postal Boxes are designed for e-commerce sellers, office managers, and individuals who need a reliable, professional way to ship slim items like documents, books, and stationery. These high-quality die-cut boxes are engineered to fit within Royal Mail's Large Letter size requirements, helping you minimize postage costs while ensuring contents remain secure. While these boxes offer superior durability and a clean aesthetic compared to standard envelopes, users should note that they are specifically intended for slim, flat items and are not suitable for bulky or irregularly shaped goods.
| Model Part Number | C4 |
|---|---|
| Brand | STORM TRADING GROUP |
Yes, they are suitable for international shipping provided the contents and weight remain within the specific postage class requirements for your destination.
The earlock lid is designed to stay shut on its own, but you can add a small piece of tape if you are sending valuable items for added peace of mind.
The C4 size is specifically designed to accommodate A4-sized documents comfortably, provided they are not excessively thick.
Royal Mail Large Letter specifications generally limit the thickness of the package to 25mm.
The boxes are made from cardboard, which is widely recyclable in most municipal paper recycling programs.
Ensure the side flaps are folded flush against the interior walls before tucking the lid tab into the slot.
Ensure you have creased all perforated lines completely before interlocking the flaps to provide maximum structural tension.
To assemble the C4 box, begin by folding the side flaps upward to form the walls of the box. Once the item is placed flat inside, fold the main lid over and tuck the front flap into the designated slot to engage the earlock mechanism. For optimal compatibility, verify your contents do not exceed the depth constraints of the Large Letter format before finalizing the seal. While the boxes are durable, store them in a cool, dry area to maintain the strength of the cardboard. If you are shipping especially heavy documents, you may add a single strip of packing tape across the lid for extra security, though the earlock is typically sufficient for standard use.
