Camelbacks?

I've used a smaller one apx 40oz that has shoulder straps like a backpack, but it was over kill i thought, I was going to use it along with my fuel belt for really long runs, but ended up finding a group to do my long runs with that would put out water stops anyway..

I've never minded the strain and uneven distribution so much as the sloshing.  Camelbaks have always been my first choice for biking and hiking.  But for actual running the belts offer less aggravation.

bts

You can get rid of the slosh by turning the bladder upside down and squeezing it till water comes out.  That will get all of the air out of the bladder and it won't bounce nearly as much.  Works best with the smaller versions of camelbacks.

I have a 48 oz wasitpack, and 2 of the 100 oz backpack style.  I use the waist one for all my longer runs.  I bought 2 of the Fuel Belt 8 oz bottles with carriers, and put those on the waist belt when I need something more than water for my runs.  So far, the set-up works well.  I've found that if you position the belt at or just above your hips, it sits nicely and your back isn't supporting the weight.

I've never really run with the backpack types, at least not like I run now, mostly because I have never needed that much water while running.  I have used them for hiking and such, though, and they worked quite well for that.  If I ever get up to the longer trail runs, I would probably be glad to have it then, especially since the one has a couple pockets and attachment points.