I started using this at Irene VII (although I was in a grenadier role) and have found it to be much better than a backpack hydration system.
http://www.dickssportinggoods.com/product/index.jsp?productId=4011106&cp=2460170.2804205.2624816.1331118
It's great for when you want to be low profile, like for having to pull a ghillie over, or look like you're not wearing a hydration pack, like while playing an insurgent or civilian.
It doesn't carry as much as some of the big systems, but it's enough for airsoft in my estimation unless you are REALLY out in the sticks with no support.
http://www.dickssportinggoods.com/product/index.jsp?productId=4011106&cp=2460170.2804205.2624816.1331118
It's great for when you want to be low profile, like for having to pull a ghillie over, or look like you're not wearing a hydration pack, like while playing an insurgent or civilian.
It doesn't carry as much as some of the big systems, but it's enough for airsoft in my estimation unless you are REALLY out in the sticks with no support.