well, i'm not the expert but the hydro bladder is two litres so there's half your space gone. I'm sure you must be able to sqeeze what you need in. The twelve litre i have takes the hydro bladder (hardly takes any room), waterproof jacket. waterproof trousers, hat, gloves thermal running top, first aid kit, moby, whistle, torch and small survival blanket. even when i do a 10 mile i will have this kit as i'm getting used to running with it as much as possible.
However, go on inov8 website, they are a wealth of tech info about their products
Also, bit of a thread here:
http://forum.fellrunner.org.uk/showthread.php?t=5103
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