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These Letterbox Boxes measure 170mm x 90mm x 20mm and are perfect for efficiently shipping small, lightweight items. Designed for rapid and easy assembly, you can quickly secure your items using the two peel-and-seal strips at both ends, eliminating the need for packing tape. These boxes conform to Royal Mail’s Large Letter size, helping to reduce postage costs. They are delivered flat-packed in bundles of 60 for easy storage and are 100% plastic-free, fully recyclable, and biodegradable, making them a great planet-friendly choice for your business.