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Internal (Approx.) Dimensions - Length x Width x Depth=320 x 230 x 20mm - Pack of 50 QUALITY - Red Rainbow PIP Large Letter Postal Boxes are Made from a quality corrugated cardboard, these postal boxes are perfect for effective and efficient shipping of your lightweight items. Design - Designed to fit inside the Large Letter size in order to save on postage cost. Postal Boxes are supplied flat packed in bundles to ensure easy storage and handling. THICKNESS - Manufactured from 1 mm Thick Single Wall Cardboard. Extra Security - Tab(s) at the front provide an additional protection while the package is in transit. Offers more protection than the standard mailer to ensure that the content inside the box stay secured while a package is in transit. SUITABLE FOR - Ideal for business and private use, to mail out your goods and items, to your customers, family or friends, in a safe and secure way. Quick and easy to assemble, sealable with clear or brown tape made of recycled material. Our boxes are supplied flat-packed, to save on storage and are Lightweight. Quick to assemble. Offers more protection than the standard mailer to ensure that the content inside the box stay secured while a package is in transit.