GP - General Purpose.
With a blackhawk vest, for the back at tleast, you'll need to use blackhawk hydration pouches if you want them centered. Any other pouches will fit just fine.
Keep in mind that anything you put back there will be unreachable. Not sure I'd go that route. If you can't fit it on the front of the vest or on a subload, you don't need it and it can go in a pack.
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