Quote Originally Posted by tatormc
The HydroBak model looks good from the pics.

I use the HydroBak bladder in my handlebar bag (the smaller Topeak Tourguide). It is small enough that it doesn't affect bike handling any more than the bag itself does. 45 oz (1 L) is enough to get you between water stops on most rides in mild weather. It would not be enough on a really hot day. I like putting the bladder there because it minimizes neck strain and back ache. If you don't like the idea of the weight on your handlebars, using it as a waist pack is still a possibility if you aren't too tall. I also have a Siren, but it only gives 5 oz more capacity and puts the weight on my back.
I find the hydration bladders to be the only solution for keeping myself hydrated on any ride. Since I'm short my frames are small and it is often hard to fit a bottle in a cage standing next to the bike, forget while riding.