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Not OP, but I love those Aussie wide brimmed hats - they're like American cowboy hats, except made for actually being used, not just for looks - however, I can't wear them (or any other hat with a rear-extending stiff brim). My backpack, with foam sleeping pad packed on top, comes up behind my head and any stiff brim extending behind my head bumps into it and causes the hat to come unseated.
My solution last year was an OR Seattle Sombrero. Even though it's waterproof, it's not too hot in the sun. It's crushable, and the brim isn't very stiff, so when it bumps into my backpack behind me, no fucks are given. The problem is that in the wind, the front brim blows up and is completely useless, both for rain and for sun. And considering that it's anywhere from moderately to very windy >50% of the time when I go hiking (the Northern Rockies, and the Utah and Arizona deserts are my primary playgrounds), that was a big fail for the past couple years.
I'm thinking of something like pic related, but don't want to look like an old lady out working in her vegetable garden. I need to get the sun off my ears and neck, and want something more substantial than a bandana under a baseball cap.