What goes wrong
Using double wall for everything empties the strong board and hides which line needed it.
Packaging Boxes lists Double wall boxes for this line. A larger single wall carton adds air and still has the lighter board.
The check before you reorder
Double wall is the stronger board, made in the UK, for heavy, fragile or stacked goods.
Store it apart from single wall. The board looks similar until you lift it.
Dispatch on that order
On Packaging Boxes, put Double wall boxes on the order with the lines it belongs to, so you are not paying a second delivery for the piece you forgot. Free UK delivery starts over £50 ex VAT.