Tissue boxes and rolls, kitchen towel, napkins, carrier bags in three sizes, cling film, foil, receipt rolls, price guns, labels and sticky tape.
Half of this department is stock for the shelf and half is stock for running the shop, and it is the half that runs out on a Thursday afternoon. We keep it because a shopkeeper who has to make a separate arrangement for carrier bags will eventually make a separate arrangement for everything.
Carrier bags are bought by weight and the thickness matters more than the price. The very cheapest bag splits with four tins in it and your customer remembers the shop, not the bag.
Add these lines to a standing order and you will stop thinking about them, which is the only sensible way to buy something you use every day and nobody asks for.