+1 on the F-stop Loka.
Lot's of versatility because of the different sized ICU's (inserts) that can be placed within. And, FWIW, I've carried this in some pretty harsh terrain / environments and can attest to the comfort with a load.
I also have a Kata 3-n-1. It works well but cannot carry as much nor is it as comfortable if you are carrying all day.
x2 on the Loka, that's what I use. Awesome bag.
Me too, been using mine for years on many trips and still going strong. Ergonomics are great too, for when you're carrying a heavier load. If mine eventually wears out, I'll probably buy another Loka, or newer F-Stop pack
Why aren't more backpacks designed like the Lowepro Flipside series? Walking around in a Flipside backpack in an urban setting provides a little more peace of mind against theft in crowds with the zipper on the "inside" to protect your equipment. Also on rural trails when you put the bag on the dirt ground to open it, you get the outside dirty instead of the side you put back on your back!
Is there any other brand that has a bag like this besides Lowepro?
F-Stop's Mountain series of backpacks does, such as the Loka several of us have.