The following size cartons can be sent for the cost of a large letter through the post, as when the boxes are assembled the external height is 24mm. Please remember that there is also a maximum weight of 750 gramms for these to be sent as a large letter. The dimensions shown below are the internal usuable dimensions.
160 x 110 x 20mm
222 x 160 x 20mm
322 x 229 x 20mm (the largest size that can be sent as a large letter).
Other postal carton sizes available are:
150 x 60 x 60mm
140 x 130 x 50mm
130 x 110 x 90mm
200 x 120 x 50mm
250 x 210 x 50mm
270 x 170 x 80mm
300 x 240 x 100mm
420 x 260 x 50mm
360 x 280 x 80mm
419 x 338 x 72mm
348 x 250 x 72mm