Well, I'll respond as if the OP is seeking advice on gear for western big game hunting.
I have this rubber scope cover strap dealy; had it for almost 10 yrs. The rubber is still pliable; think it's called a 'bra' lol. It does sorta look like one. Anyhow, that thing was relatively cheap, and has done a great job protecting my scope lenses. Kinda a dopey piece of gear, but it serves a purpose and has worked well. It covers the lenses while your out stalking game and protects the lenses from scratches from trees or brush or getting affected by the weather as you're out and about.
It has a finger tab that lets you slip it off fast when you need to. I know I just opened a.can of worms there, but it's true.