Count the job, not the habit
The carton bench and the mailer bench do not share a fill quantity.
Scale it from the gaps, not from the number of mailers.
Where it lives during that week
Keep fill at the carton bench only.
Order fill with the cartons that have a measured gap.
The reorder line
Name the fill on its own line.
A Friday order on Packaging Suppliers that includes Void fill aims for Monday. A bank holiday on Friday or Monday moves that delivery. The 3pm cutoff is still the same-day dispatch rule.
Open Void fill when you already know this line. The sack or the pack is the unit on the page. Packaging Suppliers will still dispatch an order placed by 3pm on the same day.