Roger Hicks
Veteran
Just do it. Just try everything. Carry every configuration and as many systems as you want. Sooner or later cause and effect will kick in and you'll know what you want to carry.
Carry 2 M's, a screwmount, 3 lenses, a TLR, a light meter, and a dozen rolls of film. Also pack a jacket, a bottle of water and some trail mix in your bag.
Then go shooting for 9 hours. Think you'll get tired? If so, cut back.
Just carry as much gear as you want, if your exhausted then you've brought too much.
Cut back, repeat.
Beautifully put.
Cheers,
R.