Blue Part On The Eraser
Do you remember the two-sided erasers of your childhood? There were many theories about the blue half. Some people said that it could erase ink, but they are wrong. In reality, that portion is used on paper that it is thicker than loose-leaf or notebook paper. Artists often used special paper, after all.
Square Patches On Backpacks
You would never have guessed what the lashing square or pig snout on backpacks are for. They look cool, but they are also very useful. This feature can actually carry extra gear if you have string cords with you. Simply loop your stuff there and us it to hang anything that does not fit inside your bag.