Large Letter Size Box. This is due to the uk royal mail postal rates, one of which is called 'large letters'. It also gives measurements for packets.
It also gives measurements for packets. This rate covers anything smaller than l33.3 x w16.4 x d2.5cm. The maximum size is 250 mm x 353 mm and and a maximum weight of 750g so a c4 envelope is a good choice.
Please note there are weight limitations of 750g on the large letter service and each box weighs about 75g.…
For mailing contents such as a4 sized documents, dvds, certificates, large greeting cards and magazines you would need to send as a large letter. Large letter cardboard boxes are perfect for keeping your postal costs to a minimum by complying with royal mail sizing to deliver the best possible value to you. The guide below shows you size and weight restrictions for large letters and how much postage will cost. These boxes are perfect for posting as the outer depth is well within the 25mm allowed by royal mail for large letter.