Backpack for running

Try this.

The backpack fits a TON of stuff, and has a thin profile that allows you to run with it on. It also has buckles across the chest and above the hip to prevent the backpack from moving around.

Not a jogger, but I have this and love it. It's small and when cinched down fits nicely to your back

http://www.aarnusa.com/pack_marathonmagic.htm

Deuter makes fantastic packs. It looks like the Compact Air EXP 10 would be a good fit for your needs. It is a small pack that uses their Aircomfort system. On an Aircomfort pack the only thing that touches your back is a mesh panel with an air cavity behind it. It is very comfortable and virtually eliminates the added perspiration that is usually associated with wearing a pack while running.

You can get it from REI.

The REI Flash 18 isn't made specifically for running, but I've been jogging with it for a month or so not, and it works great for the purpose. I usually run with a jacket and shoes in the bag.

I love the Salomon XA 10 I have for this since it comes with a hydration bladder which is removable. When I'm using it for carrying a post-race change of clothes, I either take the bladder out or leave it empty to be filled at the race. When I just want a hydration pack, it is small and light enough to be good for that. For me, this pack was a good balance between being able to carry a change of clothes and having a hydration pack.

I run very frequently with the Deuter Race X Air. I love this pack, mesh everywhere that touches my body, and a frame that holds the back away from my body. Plus straps that stabilize well when running. I have done many 10+ mile runs with this pack, carrying spare clothes, water, and food for long trail runs around Boulder. Plus I use the pack for running to do errands around town, getting some exercise while I do errands. The Race X Air is on the small side, so you can't carry too much, but that means it does not flop around when near empty too. Racer X Air