Anyway, a fullsize pilot bag does fit, the question is just, why carry one? One only needs the iPad, passport and license. Company provided ANR headsets are standard equipment on the plane, are they not?
A full size bag is too big for me, I was just using that as a known sized thing to ascertain the amount of room in a 73, and yes we do have ANRs on the flight deck. But I carry;
Torch,
Ear defenders (Very slim Peltor ones that fold up into a double fist sized ball),
Passports,
Stapler,
File of useful information,
Freshen-up kit (mini toothpaste, razor and deodorant - doubles as emergency night stop kit),
Pencil case (we still plot sometimes, would you believe), and spare pens,
Sun glasses,
Glasses soon, probably
Charging kit for iPad,
External battery for iPad,
Phone,
Food for the day, in its own insulated bag.
Space for the flight paperwork folder,
Hi viz jacket,
Calculator,
Errrrm........that's about it.
Tried out the bag I bought from RS components today, and it is near perfect.