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These Letterbox Boxes measure 305mm x 220mm x 20mm and are perfect for efficiently shipping your small, lightweight items. Engineered for fast and simple assembly, you can secure your items in seconds with the two peel-and-seal strips at both ends, eliminating the need for packing tape. Designed to fit within Royal Mail’s Large Letter size, these boxes help reduce postage costs. They are delivered flat-packed in bundles of 40 for convenient storage and are 100% plastic-free, fully recyclable, and biodegradable, making them an excellent eco-friendly choice.