We have Ducktape?

[atomic1fire]

Taping a small thing to a large thing(like a locker or something that otherwise can't fit in a backpack) conceals the small item within the large item. Small item only becomes noticeable upon inspection(This is an Emergency Oxygen locker. ...There seems to be something taped to the back of it.), which saves a bunch of sprite work, and can be removed from the large item by click-dragging the large item onto yourself.

The only thing I really would want if ducktape became more common would be to be able to tape a flashlight onto guns.

"This taser has a flashlight hastily taped to it"

Because it would be tacticool.