Multiple Binoculars

Hi guys,
I know how to bino jump but in all of the glitch videos on youtube the players have more than one set of binos in their inventories.
How do I do this?

DUDE YOU JUST NEED TO RESPAWN ON BINO AND YOU WILL GET 2!... BUT PPL WITH 400 ping have low chance to get 2 binos , they get 1... xD

It's sooooo easy, I made more then a hundred of them.