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These Letterbox Boxes measure 165mm x 120mm x 20mm and are perfect for efficiently shipping small, lightweight items. Engineered for quick and easy assembly, you can secure your items within seconds using the two peel-and-seal strips at both ends, eliminating the need for packing tape. These boxes are designed to fit within Royal Mail’s Large Letter size, helping to reduce postage costs. Delivered flat-packed in bundles of 60 for easy storage, they are 100% plastic-free, fully recyclable, and biodegradable, making them an excellent planet-friendly choice.