Frank O's thread about lens and other suggestions for safari trip made me think about how much the camera bag weighed that I carried wherever I went for the last 10 years of film-only.
I tried to put together a loadout similar to what I used then:
Manual focus primes:
24/2.8
35/2
105/1.8
180/2.8
Total weight: 2015 g with caps
Autofocus zooms:
20-35/2.8
35-70/2.8
75-300/4.5-5.6
Total weight: 2155 g with caps
Bodies:
1X F4 and 2X F4E
Total weight: 3900g with body caps
Film:
2 bricks HP5, 1 brick Agfachrome 21 and 1/2 brick Ektapress 800, 70 rolls in all
Total weight: 1500 g without boxes
Speedlights:
2X SB-24
Total weight: 810 g with remote cords
Batteries:
2 bricks of 24 AA cells
Total weight: 1600 g
Billingham 550 bag
Total weight: 2500 g with relevant superflexes
Filters and cleaning supplies
Total weight: 700 g
This gave a total loaded weight of slightly over 15 kg. This was quite typical for a week long assignment even if the bag was slightly lighter when I could foresee what lenses I would need and leave some at home or didn't need all three bodies as I didn't always need B/W, slide and fast colour print film at the same time.