I stitched a bottom in it like a stitched-in toe plug using the same weight leather as the rest of the pouch. Although I didn't do this, it might help to punch the center of the bottom out big enough to push the cylinder up from the bottom with your finger, too.
Since we're off topic here, I'll split these last couple posts off into a new thread just for this rig you're building. We can continue this there.