Hydration Packs on PFD's/Seats

My solution was to drape my camelbak over the back of my kayak seat using the pak arm straps.  It's a larger one that holds extra gear so I used the waist strap/clip on the hydration pack and attached it around the kayak seat clips.  I kept the drinking tube attached to the pak sling for easy reach over my right shoulder.

I've also considered strapping the hydration pack in my milk crate and feeding the hydration tube over the top and to the seat.

http://nrsweb5.richfx.com.edgesuite.net/image/media/70861_01_050514_150x150.jpg
what about this from NRS?

that's pretty neat, but i don't have that kind of deck space on my yak, and it's a bit beyond what i can spend.