Back in PNG the Nav bag had a few extra 'goodies' in it other than the required documents. We also carried two separate containers about 12'' square by 3'' deep which had Emergency rations, water and a first aid kit. The other container had flares, parachute and smoke.
My Nav bag's extras were
Maglite torch
Spare batteries
Smokes and a spare lighter
Condoms
Smith and Wesson Mod.41 Pistol
Box of 50 rounds for the above
Barley sugars or similar
A sharp knife
Electronic calculator
Couple of spare pens
Can't remember what else but there probably were a few more things.