Ah! Kneeboards & flight bags!
My kneeboard is the A5 aluminium plate with its riveted clip removed from one of those ASA tri-fold things. I clip PLOG, maps etc to it & keep it down side of the coaming next to the windscreen.
My nav bag is an old yellow surplus canvas satchel. Much better than those bloody large black cases you see people with. Mine can be positioned between the front of my seat and behind my legs without interfering with anything. Everything in it is accessible in flight.
If not flying it can be slung over my shoulder.