600 millibags
Heard an ad for a monstrous refrigerator.... "holds 31 cubic feet, or 32 bags of groceries."
I hadn't thought about this before, but "bag of groceries" is a
natural unit that has recently changed.
Paper or plastic? A typical paper bag holds 1 cubic foot, and a typical plastic bag holds about 0.6 cuft.
This probably contributes to
silent inflation, the same trick that grocery manufacturers use with toilet paper and candy bars. You're carrying the same number of bags but getting less actual content.
I'm
not complaining. Though I initially resisted the change, the plastic bag is
vastly superior for walking. Paper bags stand upright and fit neatly in a car seat or trunk, but there's no comfortable way to carry a full-size paper bag.