I've outgrown my MaxP Typhoon Backpack and just picked up a 5.11 Rush 12. Now I'll need a compatible hydration bladder. 5.11 says the Rush 12 will hold a 60 oz bladder, and it has a velcro loop at the top of the bladder compartment to hold it up. What bladder would work the best? And where is a good place from which to purchase? I've been researching Camelbak, Source, and Platypus bladders, are there any others I should be looking into?