Those two backpacks r all big enough for ur gear with large capacity~
I’ll take Flipside 400 AW for my decision~
It has unique back-entry compartment provides easy access to camera gear,when u wanna capture the shot in a moment,nd’ also a hideaway tripod holder to secure a tripod or monopod to backpack~
I don\'t think you need these bags that you mentioned, It\'s too big size and heavy.
By teh way, I suggest you to buy the Lowepro 350 fastpack, it\'s suitable to your capacity and two way totes can save your energy for long distance walking...