I have used Aluminum Foil for decades and never paid attention to this fact!
The wrap container, the aluminium foil comes in, has a neat little feature.
There are perforations on the sides of the container called end locks. When you push them in, they keep the roll secure inside of the box.
When you want to tear off a piece now, the roll stays in the box!
Many other similar products, such as plastic wrap, also have this feature.