wotsa nav bag?
I got a whiteboard marker for writing notes on the window, and a pen for writing notes on my hand (I actually dispensed of these recently when I realized I wasn't fooling anyone. they all know I can't write). there's always a map under a seat or in a seat back. Pax bring their own chundersac. I got an ASIC for slipping under the gate latch at Darwin. I can't afford muesli bars, and the 50c 2 minute noodle taste like crap without chili sauce.
Don't carry water....... its gotta come out again eventually.
Aah, nav bags just encourage you to carry crap you don't really require.
You mob are just over equipt.