Well I have a stock pack on my rifle, well I did on the old stock, and that is where I kept my two spare mags. I usually just have a camel back under my ghillie.
That and what type of ghillie are you thinking about buying? And what about making one. I know my last one I traded a person here on the forum for. But I have made my 4 others. Feels really good when they are done and you get to use something that you made