Count the job, not the habit
The mailroom runs out of one size first. That size is the reorder, not a mixed assortment.
Count the soft dispatches of that size.
Where it lives during that week
Keep each size in its own shelf slot.
Order grey mailers for the unbranded outer. PayPal branded bags are a separate range, in 250 x 350 mm, 305 x 405 mm and 425 x 600 mm.
The reorder line
Reorder grey, and the size.
On Packaging Suppliers, orders that include Mailing bags and are placed by 3pm are dispatched the same day. UK delivery is free on orders over £50 ex VAT. Stocked items can be returned within 14 days.
Open Mailing bags when you already know this line. Packs are the unit. Read how many bags are in the pack. Packaging Suppliers will still dispatch an order placed by 3pm on the same day.