What kills me is Time's air of surprise. The point of so much of marketing, especially price promotion, is exactly to confuse people into buying. So of course this stuff will be phrased in ways that are hard for people to evaluate.
I now buy the 2L cartons...
Fruit items in a pack (e.g. 6 oranges) - price per unit is shown.
Fruit items loose - price per weight shown.
So you can't compare which is cheaper. I assume loose...
They are sold in bulk from drawers so you can buy as much or as little as you want. (You put them in a bag and write the item number and quantity on it, and they charge you whatever you wrote.)