Maxpedition has been bombproof for me and I am not gentle on them. No experience with the 5.11 stuff, but I've had friends who've used them hard and tore them up.
Personal preference....
I dislike the sling bags that position at your hip. I find them always to be in the way of something. Gun, Reload, Knife, Wallet, Phone, something.
I prefer the style that sits at the small of the back. Look up the Remora, Lunada, and Malaga. Three different sizes of the same basic bag with the remora being the smallest. No dedicated water bottle pocket, but..... pick up an appropriately sized rollypoly dump pouch and attach it. Unroll it and stick your water bottle in it. Roll it up when not in use. Not saying it's the only way to skin a cat, it's just the way I skinned that cat.....