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Our large letter postal boxes are made from Heavy Duty single wall corrugated cardboard and are the perfect flat pack boxes for posting. Offers superior protection when compared to padded mailing bags Each large cardboard box will last well when shipped with couriers, ensuring your items remain protected during transit. Also known as letterbox boxes, made from rigid e flute cardboard 1.5mm thick A4 Postal boxes supplied flat packed to save storage space, easily folded and assembled in under 30 seconds. Boxes are then secured for post with a small amount of tape Envrionmentally friendly, made from 70% recycled material and FSC certified. 100% biodegradable and 100% recyclable C4 postal boxes that can also post as small parcel postal boxes Fits within the Royal Mail Pricing In Proportion size parameters, these boxes are commonly used as a delivery box for subscrption companies and can be posted straight through a letter box