Measure before you open the range
Measure the goods, then take the close size. Empty space is a fill problem you have just bought.
Single wall is the everyday board: strong, affordable and versatile, for a normal dispatch weight. The page for Single wall boxes is where Packaging Boxes shows that line.
The published limit, if there is one
The single wall range is the general cube. It is not the double wall range, and it is not a postal format by itself.
Double wall is the stronger board, manufactured in the UK, for heavy, valuable or fragile goods and for a stack. A bigger single wall box is not that board.
Write the size down
The reorder is the dimensions and single wall.
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.
Open Single wall boxes when you already know this line. Bundles have a quantity. Read it before you order one bundle and expect a hundred. Packaging Boxes will still dispatch an order placed by 3pm on the same day.