Might be a dumb question...Mystery Ranch Pop Up 40

[Luked]

Brother just bought a Mystery Ranch Pop Up 40 pack.
This is his first higher end pack.
When we got it in I noticed this on the top of the pack.
What is this for? is it to add something as far as an accy?
almost looks like a piece is missing but the images of others i found online show the same.
Just dont know a lot about the Mystery Ranch stuff.

 

[Jethro]

 

[Jethro]

 

[Mighty Mouse]

It's a 1/4-20 thumbscrew intended to be used as a place to mount binos, spotter, ballhead, etc.

 

[Geewhiz]

Well how about that

 

[Luked]

Interesting.
I would have never thought.
Glad I asked.

 

[prm]

It’s not the worst idea I’ve seen. Interesting.

 

[EdP]

So inexpensive, so useful. It's brilliant!