Why not? Isn't that obvious? They're either cheap or free and they're light and very strong. I bough a few for storage, they were like $4 at Target. Then I was using one of them on my bike for a while. I stopped using it because it made the bike very top heavy when loaded so I just stuff my panniers with heavy items and attach light things to the rack with cargo net.

For me it started in mid 30s. Now (44yo), I can't stand anything that puts form and looks over function and utility. I still try to make stuff look good, if possible, but it's my secondary concern.