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Thinktank and Domke are the only real pro bags out there
ThinkTank has modern designs designed for journalists and travel, they maximize space for modern gear to carry on air travel dimensions. Life time warranty on everything except zippers.
Domke is a traditionalist bag great for walk around shooting when you bring only what you need for the day. you will also get the nod from people in the know, expecting that you've got a Leica in that bag and not some plastic Fooji
LowePro's older bags were good but are now dated and don't fit modern needs quite right. the newer shit is just shit, cheaply constructed with cheap materials for casual use.
Kata makes nice super light shit but I don't know how long it lasts.
My Crumpler 6 million dollar home has really stood the test of time. the old stuff was solid as fuck but I don't know about the new stuff