I don't know about you, but I always find that when I need to pack for a shoot or a trip or even just a day away that I over pack, then I think to myself "Just go simple, stop with all the gadgets already" then I strip out all the bits and pieces and end up with a laptop bag, then I think to myself - BUT WAIT! What if you see the best photograph in the world and you can't capture it? What if your iPhone just won't do? Then I re-pack and end up like this is well on its way to looking...
I do have a specific shot in mind for the Phantom, and I know I'll be annoyed if I can't capture at least some shots in water (Sony 4K ActionCam) ...then I thought "Just take the a7R2 with the 16-35... I ended up with the 90mm Macro (Also as it's the longest lens I have) and the 55mm f/1.8 because it's a fun lens and a great focal length... Anyways...