My friend got the MULE with a 100 oz reservoir the other day and he likes it quite a bit... Personally I'd suggest the HAWG or Blowfish... His didn't come with the nice new reservoir that has the 90 degree bite valve, though. I like the blowfish because it's actually expandable. The only thing about it I don't like is the fact that it doesn't have any exterior bungees like the MULE and HAWG have. As far as the Deuters are concerned, I've never even heard of them so I can't make any comments about it.