I use Red gaffer tape on my large lens as in the picture for the same reason. It sticks out so far it warns people so they don't walk into it as I'm shooting
I use one (different brand), but it gets in the way a bit. The rearmost piece interferes too much with operation so I've taken it off. The large piece which covers the zoom ring plus some barrel prevents the hood being reversed onto the lens - I'm still using it though.