What goes wrong
The reorder is the dimensions and single wall.
Packaging Boxes lists Single wall boxes for this line. The single wall range is the general cube. It is not the double wall range, and it is not a postal format by itself.
The check before you reorder
Measure the goods, then take the close size. Empty space is a fill problem you have just bought.
Store sizes in columns. The print on the bundle is the size. The end of the bundle is not.
Dispatch on that order
A Friday order on Packaging Boxes that includes Single wall boxes aims for Monday. A bank holiday on Friday or Monday moves that delivery. The 3pm cutoff is still the same-day dispatch rule.