Not in my experience. Though ink seepage definitely seems to be related to how it's stored (and probably shaken). I've had one seep when stored point down, and

Not in my experience. Though ink seepage definitely seems to be related to how it's stored (and probably shaken). I've had one seep when stored point down, and dozens not seep when stored horizontally or point up. That said, I don't travel with them, practically speaking.