The best would be to base luggage sizes and weights to that which is allowed on your international flight.
However, if you are doing a fly-in safari in Namibia, you will be restricted to a possible 10kg limit. This is due to the light aircrafts not having large luggage compartments as well as keeping the weight down as much as possible. Namibia being a hot country, has very thin air so an aircraft cannot be overloaded and private charter companies stick strictly to the weight allowances on board these flights. Keep in mind you are not only restricted by the weight of your luggage but the actual dimensions of your luggage needs to comply as well. The final luggage weights allowed are usually calculated on the individual passenger weights and therefore this can change. We always recommend to check this with your consultant. Packing light for most is never easy, but the good news is that most lodges offer laundry services so just pack the most important essentials and where necessary you can have them washed along the way. If the fly-in safari is only a portion of your travels and you’ll need to store excess luggage, speak to your consultant to discuss the possible options based on your itinerary.