I started out in the the 90's using minimalist 70oz. Camelbacks, mostly because of racing. Stuck with that size out of habit until 2002 or so when I picked up a Camelback Mule- 100oz. bladder and a bunch of storage, I won't be going back.

With my tool kit via small seatbag, I can carry pump, first aid, food, odds & ends rain jacket, lightweight set of clothes.

It is probably a good thing that you were able to check out the Mule in person, giving you a notion of whether it (or maybe the Hawg) has the amount of room you desire.

Some of the things I like about the Mule is the compression straps, multiple compartments, waist strap and sternum strap. These all serve to minimize the bulk and stabilize the pack so it won't annoyingly bounce around. I have not seen the Hawg, but I assume it has similar if not the same features.

The Kriega hydration pack looks very interesting, as well.