I posted this chart run down list on an aid workers web forum many many moons ago but I think it could be still relevant today.
10. Extra toilet paper - you never know when you might need it. 9. NGO T-shirt - to facilitate bonding between clones of aidworkers. 8. Desert boots or Teva sandals - soooo fashionable in the bush. 7. Maglite torch - to throw light on any crisis including a midnight dash to the pit latrine. 6. That waistcoat - you know, the one with all the pockets (making anoraks look hip). 5. Cargo pants - more pockets in case you don't have enough to hide BP5 biscuits in above waistcoat. 4. Leatherman or Swiss Army knife - something to fiddle with when stressed out. (Which type are you?) 3. Handheld VHF radio and corresponding call sign - the must-have accessory to make you feel important, (remember to keep it on even in meetings). 2. Shades - the all round reflective kind so that nobody sees you dozing off in coordination meetings. 1. Aid-workers arm - one arm a slightly darker tan than the other due to hanging it out of the window of your Toyota or Nissan 4 by 4 in the sunshine.
If you have any interesting updates I would like to hear from you.