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Royal Mail Large Letter Size Boxes

A5 kraft box and lid a5boxk

We have a lot of customers asking us what boxes we sell that are within the Post Office’s regulations on Large Letter sizes. So, we’ve made a list!

What are the Royal Mail Large Letter Size Dimensions?

A large letter sized box can be no larger than 353 x 250 x 25mm, and weigh no more than 750 grammes.

Please note, due to the manufacturing process, there may be a very slight variation of size. It is strongly suggested you order a sample and check it yourself.

Royal Mail Large Letter Size Compatible Boxes

These boxes fit within the permitted size as allowed by Royal Mail.

  • A5 kraft box and lid a5boxk

    A5 Kraft Box & Lid 230x164x19mm

    £1.48 Per Unit
    Product Code: A5BOXK
  • A5 white box and lid a5boxw

    A5 White Box & Lid 230x164x19mm

    £1.4 Per Unit
    Product Code: A5BOXW
  • A6 kraft box and lid a6boxk

    A6 Kraft Box & Lid 164x116x23mm

    £1.24 Per Unit
    Product Code: A6BOXK
  • A6 white box and lid a6boxw

    A6 White Box & Lid 164x116x23mm

    £1.24 Per Unit
    Product Code: A6BOXW
  • flat folding white carton gift box

    White Card Box 107x90x20mm

    £0.22 Per Unit
    Product Code: W43
  • flat folding white carton gift box

    White Card Box 118x48x23mm

    £0.16 Per Unit
    Product Code: W41
  • flat folding white carton gift box

    White Card Box 45x31x16mm

    £0.14 Per Unit
    Product Code: W11
  • flat folding white carton gift box

    White Card Box 57x38x22mm

    £0.14 Per Unit
    Product Code: W21

We can also make boxes to your requirements! Our custom made packaging and printing section has everything you need.

Other Postal Supplies

Bubble Bags, Padded Envelopes, Jiffy Bags and Mailers

Parcel paper, bubble wrap and corrugated cardboard rolls

Tapes & Dispensers, Envelopes, Postal Tubes, Luggage Tags, Shredded Polypropylene, Wood Wool and Loose Fill

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