Mailing Packs & Boxes
Triplast 457 x 305 x 254mm Medium Single Wall 18x12x10" Shipping Mailing Postal A3 Cardboard Boxes (Pack of 50)
Triplast Corrugated Single Wall Cardboard 50 Flat Packed Boxes 18x12x10" (457x305x254mm) Made of quality material
https://www.bizrate.co.uk/mailingpacksandboxes/triplast-457-x-305-x-oid9930716965.html