Psychology says people who save shopping bags inside other shopping bags are responding to an ancient survival instinct

At its heart, this habit is rarely about the bags themselves. It is more about psychological efficiency. The brain naturally seeks to reduce uncertainty, prevent waste and prepare for future needs. A larger bag filled with smaller ones may seem trivial, but from a psychological perspective, it often symbolizes a much deeper desire for security, readiness and control.

Raccontata daeconomictimes.indiatimes.com