I already had a Blackhawk backpack with the hydration system installed but I needed a carrier for my tac vest. I chose the Blackhawk because I new it would be compatible with my 100 oz bladder I already had with the pack. The bladder fit right in and the carrier was easy to attach to my vest with the Strike clips provided. My only two cons are it is a little expensive for a nylon bag and for the price I think some shoulder straps should be included so you can use the carrier by itself.
Pros: Attaches easily to tac vest
Cons: No shoulder straps to carry it without a vest
This review was written in the old system and had content requirements that are different than reviews written today.