Count the job, not the habit
Book orders are the quantity. Mixed parcels are not.
One per book-shaped order.
Where it lives during that week
Store wraps flat.
Order wraps for books and cubes for the rest.
The reorder line
Reorder the wrap size.
On Packaging Boxes, put Book wraps 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 Book wraps when you already know this line. Read the pack count. Packaging Boxes will still dispatch an order placed by 3pm on the same day.