I'm flying SA in September and yes, 8Kg is a bit on the light side.
My plan is:
- Use my wife's handbag for some bits and a small lens (women get a handbag as well as hand luggage).
- Use the pockets in my combat trousers for some other bits and a small lens (just zip the legs off and put those through the scanners to save time emptying packets).
- Ship non-essentials in the hold luggage as I get 2x 23Kg and I've got a Peli-like case that's going to have a Parrot drone, batteries, camera batteries, spare phone, filters, trail cam and batteries, etc.
I suppose a camera vest would work well too, but I just can't bring myself to buy one.
Just pack what you NEED to pack in your hand luggage.
I did a trip a few years ago and the all-up weight (hand and hold luggage) was only 15Kg. Now that took some planning to pack and strip stuff down to essentials - battery grips removed, minimal spare batteries, minimal clothes and I "wore" a lot of stuff onto the plane in pockets
Don't forget to enjoy the trip and look atthe wildlife through your eyes