Measure before you open the range
The tube length has to clear the roll.
A postal tube takes a roll without crushing it into a square. The page for Postal tubes is where Packaging Boxes shows that line.
The published limit, if there is one
Tubes are their own range, for posters, plans and other rolls.
A square box needs fill in the corners and still presses a roll.
Write the size down
Reorder the length.
A Packaging Boxes basket with Postal tubes still leaves the same day if it is placed by 3pm. The terms aim for 5.30pm the next working day. A 1 to 3 day courier is also described, depending on the lines.
Open Postal tubes when you already know this line. Check how many tubes are in the pack. Packaging Boxes will still dispatch an order placed by 3pm on the same day.