i never found a scope or bino cap that i liked. finally had an idea that works- took a piece of ace bandage and make a band that acts like a weak rubber band - overs the scope/bino lenses and body and pops of in a instant with a touch of the finger. tie a string to the ring or body so it doesn't fall off

I use a strip of tire intertube its water proof and flys off when needed...This method has been around for ions and still the best out there..if you lose one, make another or carry a spare.