Binocular Lens protection? Deer hunting day pack.

[tomneal]

So...
I now have two deer rifles. One with good quality lens covers and one without. I took both to the range last week and the optical quality was substantial.

I recently upgraded my binoculars from a 30 year old pair to some decent Nikons.

The lens protectors do not stay in place when they are in my day pack.
In the deer stand, I noticed that the lenses are not as clean as I want.

I thought about trying to find a small nylon bag that would keep the lens protected even if the lens caps fell off.

Does anyone else have this problem?
What solutions have you tried?