Many of us field photographers find 4x4 filter systems too bulky. My preferred solution is to buy step-up rings for all my lenses and use glass screw-in filters of the size of my largest lens.
Actually, I have two filter sizes. Since my ultra-light kit has lenses that only go up to 52mm filter size, I've adapted all the smaller ones (some Series filter sizes, some 49mm, 40.5mm, etc.) to take 52mm filters using step-up rings that live permanently on the lenses. I then carry a filter wallet with six 52mm filters. Sometimes I'll carry another filter or two in my pockets if I think I'll need them.
In my heavier kit I have lenses that go up to 67mm, so I have a 52mm-67mm step up ring for all the lenses already adapted to 52mm and I have step-up rings for other lenses between 52mm and 67mm to adapt them to 67mm. I don't really like to go larger than that
I have a filter wallet with eight or nine 67mm filters and the 52-67mm step-up ring. It's still a lot smaller than carrying the hood and all those 4x4" filters.
Since you'll likely have to buy adapter rings for all your lenses anyway in order to use a 4x4 system, this might be a viable solution as well. And, you'll have the option of using coated optical-glass filters.
Best,
Doremus
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