I don't know if all grandmothers did this, but growing up in the 70/80's I spent a lot of time with my grandmother, and loved every minute. She was always saving containers and bottles and reused them.... for example the plastic butter container, plastic yogurt containers, milk containers you name it she saved it. If you went into her refrigerator, just because it was a sour cream container didn't necessarily mean there is sour cream in it... lol I thought it was hilarious as a kid...... now like 30 years later I find myself doing it. I'm not a hoarder or anything, but I catch myself buying a jar of nescafe, and thinking hmmm what can I use this jar for later? I am wondering how it happens? When do we become our parents and or grandparents?