When I use a bladder, I alternate between an old Camelbak military version (Omega, maybe) or a 3L Platypus Hoser. I have no complaints with either, the Camelbak is heavier and seems more durable, but neither have leaked. I did have a bite valve freeze up on a Platypus a couple years ago, and it went completely to hell. Haven’t had that happen with the Camelbak.