ww2 RAF navigators bag

I’m not an expert on Bomber Command kit, but just as an “enthusiast’s guesstimate” I would think that A) a Nav’s bag would be a standard bit of kit for all aircraft types and the B) even in the heavy bombers the Nav wasn’t always at the table. On the Lanc there was a folding “second Dicky” seat behind the pilot and the Pilot’s headrest could be flipped down as something to lean on, so a Nav would sometimes sit in this position when D/R  navigating in daylight, at low level etc. 

This is how the BBMF Lanc Navs work today, sitting behind the Pilot rather than using the table.

Thanks for the reply but what about a Lancaster navigator, i thought he did not need a chart board as he had a dedicated table with a fixed rule on a pantograph arm or am i wrong ?

To carry the chart board!