Designed with the cyclist in mind, the Draft is great for a light day on the trail as well.  The current  Nalgene Draft offers more cargo area, and thoughtful features too.

The foundation of the Draft is it's 3 liter CXC bladder.  A fuel level window allows you to see how much liquid is still in the bladder at a glance.  The extra wide bladder port, quick connect access and magnetic clip for valve attachment make it easy to use. 

IllumiNITE panels provide improved visibility and safety.  The ergonomic back panel w/ perforated foam offers improved ventilation, and the contoured shoulder straps and adjustable sternum strap make for comfortable carry.  The new Draft has greatly increased cargo area at 365 cu. in., while the hydration bladder is housed in it's own insulated compartment.  Also features light clip strap, organizer in cargo compartment, and bungee straps for extra storage.  Draft is adjustable to fit medium-large body types.