One thing I like about the Eagle Industries gear over the competition is the fact it is made in the USA and their designs are original or credited where needed.
Blackhawk makes nice gear but, they have a bad reputation for copying other people's designs. I have looked the Blawkhawk gear over pretty thouroughly and, for my needs have been able to honor the originators of the design with an equivelent quality product at the same pricepoints. Granted, Eagle Industries and Camelbak don't have the cut throat online dealers Blackhawk does but, you can still find them at a good price.
Camelbak stuff is mighty nice too in the smaller packs. The Military packs are built tougher then the sporting lines so, check them out if what you find at the local store doesn't meet your needs for durability. Again, one thing I like about Eagle Industries over Camelbak is the fact that Camelbak stuff is made overseas. I haven't found a hydration pack I like better then the Omega reservoirs so, I have a couple Camelbaks that serve me well. The Military shoulder straps are well padded and the ventilator backs are nice. The new HAWG is a good pack with its revised compression straps and hide-away hip belt/strap. Much better then my old pack with stuff dangling all over the place. The top compression strap on the Motherlode needs to be altered to work the way the new HAWG system does and, the ventilator back would be a welcome addition.