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Not sure what you mean about attaching the hydro pack. As far as I know you just fit it in the assault pack's internal sleeve. Not sure about the main pack.
Is your pack one of the Source 3L packs with two 3/4" fastex at the top and bottom? I'm quite sure those fastex are there so you can stow the shoulder straps and attach the unit directly to the back of your armour. There's lots of photos of Marines who snap the top set of buckles around the drag handle and the bottom set through a row of PALS.
I know the Brits use the same pack; a few of their vests have integrated 3/4" female buckles on the back to allow one to quickly attach and detach the hydro pack.
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