Measure before you open the range
Reorder the internal size you already measured. A near size is a different carton.
Single wall is the everyday board for a carton line you reorder by size. The page for Single wall boxes is where Packaging Wholesale shows that line.
The published limit, if there is one
The category describes single wall as strong, affordable and versatile. Double wall is the stronger board, manufactured in the UK, for heavy or fragile goods.
Moving a heavy line onto a bigger single wall carton does not make it a double wall carton.
Write the size down
The reorder is the size, single wall, and the quantity.
A Friday order on Packaging Wholesale 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. Cartons are pack quantities. The page says how many are in the bundle. Packaging Wholesale will still dispatch an order placed by 3pm on the same day.