Kifaru, First Spear, and Goruck are worth looking at, prices are higher than Tactical Tailor. I have several products from TT, and they are made very well, shipping and customer service are spot on. I just got a second hand First Spear Comm pack, and it's also overbuilt as far as stiching, nice zippers etc..
My Goruck packs are the best constructed packs I've ever seen. I was just looking at some 5.11 packs in a store, and they aren't even in the same ballpark. The mesh on the interior seemed weak, the zippers have small teeth, and the padding looks like it will wear out under heavy loads. Problem with lots of tactical packs is the excessive features, compartments, too many zippers, and other failure points. There may be lots of space, but if it's divided up into four sections, you will be limited on what you can carry. I can stuff a sleeping bag, a large pair of boots or other larger objects into my Goruck GR1, but not some of the compartmentalized tactical bags I've seen. Plus, I don't want to look like I'm wearing a tactical bag in urban areas or work, thus the Goruck and the Comm pack(Comm pack looks like a college kids laptop backpack.
I have a Kifaru cargo carrier on order, it's going to be for backpacking, they have a great reputation and make great looking tactical packs.