I have a   
Camelbak Mule which comes with a 100 oz bladder.  I found it ideal for EDC gear (maxi-kit), but not much else.  If all I needed was the 10 Essentials (water, FAK, fire making kit, trash bags et al) it was okay, but not big enough for additional clothing other than a pair of socks and maybe a long underwear top.  Recently I found a   
Camelbak Rim Runner which has the same 100 oz bladder but a lot more room for additional bulky items.    
Rim Runner Reviews