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These Letterbox Boxes measure 225mm x 150mm x 20mm and are ideal for efficiently shipping your small, lightweight items. Designed for quick and easy assembly, you can secure your items in seconds using the two peel-and-seal strips at both ends, eliminating the need for packing tape. These boxes fit within Royal Mail’s Large Letter size to help reduce postage costs. Delivered flat-packed in bundles of 40 for convenient storage, they are 100% plastic-free, fully recyclable, and biodegradable, making them an excellent eco-friendly choice for your business.