I ran across a stupid great deal on a barely used ILBE 2 and have thus joined the ILBE club. Now, I'm looking into hydration systems. I'm a bit late to the hydration system game, especially in military bags. I've looked around, but other than the quick start card there doesn't seem to be any really good documentation on the ILBE when it comes tohydraton. A few questions, since I know we have ILBE and FILBE monkeys out there: Is there a specific way that the ILBE hydration system is used with/connected to the pack? I would expect that there is a standard way the military wants the bags packed including hydration. The only thing I do know is that the pack has openings to accommodate the tubes. I don't even know if the system is designed to be carried inside or outside the pack. The FILBE hydration system looks like an improvement over the ILBE WXP system especially when it comes to the carrier itself. I'm not sure how compatible it is to ILBE. I'm honestly not even certain I want to go with a hydration system at all, or if I'm going to.stuff water bottles in the mortar pockets.