You Clicked That Link Didn't You backpack

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No matter where you go, you will probably find someone who can answer "Yes" to that question

Homework could get a lot more secure

from here

Banning backpacks really doesn't seem like an effective countermeasure to prevent gun violence. If you try to ban everything that a student might hide a gun inside then pretty soon kids will have to come to school naked.

If Houdini had a backpack

from here and here (image source)

Maybe if Newt Scamander had employed something like this his fantastic beasts wouldn't have kept getting away.