Pouring forth from my notes on the subject:
> Apidura Frame Pack Hydration Bladder
> Blackburn Outpost oversize bottle mount holds 1.5 liter Nathan
> Cnoc Vecto Bladder
> Platypus bladder (mentioned above)
> Rotopax Rollpax 1.5 gal water storage
> Widefoot LiterCage holds Nalgene 32oz wide mouth