on a long 3d competition can you sit down with a pocket quiver
that has a flap in your back pocket
your experience appreciated before I put up the cash

thanks

Yes you can sit but its kind of a PIA. Ha ha.
It's like sitting on your wallet, I assume that's the answer you're looking for. Obviously it's easier to sit on a stump than a chair with a back and if its not attached to your belt you could just pull it out when you sit.
I like pocket quivers, usually I carry them in my shorts cargo pocket.

I use a pocket quiver that is not fastened to my belt. I always pull my quiver to sit down or my arrows would be in someone's way.

I also use a pocket quiver that is not fastened to my belt. I slide the belt flap under my belt. When I go to sit it is very easy to just remove it from my pocket. Been doing it this way for 30+ years.

Mine just has a flap to allow arrows to "seek" the gap.  It is not fastened to the belt.  You can sit, but I just pull it out, easily put backup.  Nice for  up to half dozen arrows

I am wetting sold on a pocket quiver

thanks