Have you seen that square on a snack bag? It is a QR code. You can scan it with your phone.

Today, I tried it after lunch. The bag had small chocolate cookies. I opened my phone camera. Then I put the code in the box.

A page opened. It showed what was in the cookies. I expected only an ad. But I found helpful details, too.

Now I check the small square first. Then I throw the bag away. A tiny code can make a snack bag feel much bigger.