Count the job, not the habit
The flat-document slot runs out on its own. Mailers can still look plentiful.
Count flat documents, not all outgoing post.
Where it lives during that week
Store them flat, largest at the bottom.
Order board-backs for the flat post and mailers for the soft post.
The reorder line
Reorder the board-back size, not “envelopes”.
On Packaging Suppliers, put Board-back envelopes 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.
Open Board-back envelopes when you already know this line. The pack count is on the product. Packaging Suppliers will still dispatch an order placed by 3pm on the same day.