Item parts you never know are useful

Cart loops

The use for this little cut-off space in shopping carts and trolleys seem to have been forgotten even by store owners. It is actually put there so you can separate fragile items such as eggs from the rest of the shopping and also minimize how they move about.

Which of the above did you know the use of beforehand? Is there any widely used item whose use has been forgotten by the world? Do let us know in the comment box. Do not forget to watch the YouTube video attached to learn more!