a couple of things there
storage for lumbar pfd or while you are wearing it???????
why can't any of these hydro packs work it so the stem, or drinking tip, can be supported in position so you don't need any hands to drink for it.
i would like to see some more progress on the bumbag type hydro packs personally
cheers
Hands free - yep
Allows full range of paddle motion - yep
Protects you from the sun - yep
Meh,,
No super impressed with this. I prefer the Running Camelbaks for SUP. Octane LR is my weapon of choice - super light, the bladder sits down low and wraps around your hips like a bum pack, there's plenty of storage if needed and most importantly holds the drinking valve up near my face so if I want a drink I just turn my head a little & drink hands-free.
As part of their new SUP range, 3 SUP specific hydration packs they do do a bumbag style one and from memory it is 1.5ltr, check out their website that's where I saw it. Pretty sure it has a clip to pit on your shirt to keep close to the mouth.
Im using the DaKine bumbag hydration pack, the only thing I don't like is that it tends to work down your hips as you paddle. I tend not to do really long paddles (usually no longer than a leisurely 9k but more often around 5k). I just find the backpack types with us more generously proportioned gents tend to be a bit of a squeeze.
I've got the Dakine Sweeper (1.4 l) and I've recently bought the Camelbak Baja (2.0 l) from hiking.com.au, for long distance cruising.
I ve tested it in light up and down wind condition for one hour.
The Baja is as comfortable as the Sweeper.
The harness part of the bag helps the lumbar part not to work down your hips with a weight free feeling for the upper body
The bladder compression system is easy to use.
I ve replaced the bite valve by a angled one and fitted it like on the Molokai model.
I ve fixed the safety whistle in a pull down position for a easier use.
The most expensive h2o system but the most advanced for SUP.
I use the new Vest PAC. I love it,it's More like your wearing a second(2nd) skin than a backpack with water in it. They are designed so you can wear your shirt over the top of it if you want which is perfect if you have sponsors brands to show off on your shirts. Check out vestpac.com
Is there a combination PFD hydration pack on the market. I am looking for a PFD to buy and was just thinking if a hydration pack came as part of it that would make it a one stop shop.
Lacey, are talking about a Bob Dylan harmonica holder... Kind of like playing the harmonica while strumming a guitar ! 
But you would only need to break stroke for a split second with the Molokai Pack. ^
If I did a Molokai, I would be planning my trip around 2 picnic lunches while sitting and resting on my board enjoying the scenery! Maybe even seek permission to start 30 mins early, so I can watch the elite paddlers come past during my first lunch break! 
lacey, could you use some copper "bonsi" wire to mold the drinking stem into place?
RPM I wouldn't use a hydration pack when in the surf but when Im doing a distance run on my 12'6 I find I dehydrate quite quickly. A good hydration pack is an essential for any sort of distance paddle i reckon. Cause I could also just be getting to that age 
www.VestPac.com
www.watershack.com.au
* 1 litre reservoir with high flow rotating bite valve, easy access compartment in back can fit your own 2 litre reservoir also.
* Large front pockets for gel/gu packs, phones etc.
* Airmesh panelling so no sweating up against the skin, water & air flows straight through keeping you cool.
* Comfortable & flexible elastic straps at waist & shoulders
* Low profile to wear under or over a shirt/pfd etc
* No bouncing or rubbing & unmatched for comfort.
This is the camelbak bumbag, note can carry pfd in it. 1.5ltr, additional Features: Paddle holster, safety whistle, water-friendly materials, Camel Clip™ bite valve positioner, stretch overflow storage, PFD compatible
Designed to carry: Inflatable PFD, waterproof electronics case, sunscreen, extra layer, snacks
Also saw this while looking around the site, compression combined with hydration
i was using the bum bag type, then tried the back pack again. went back to bum bag.
in tricky conditions i noted i fell more often with the back pack then the bum bag.
when you are teetering on the edge of your balance that extra slosh of water just seems to nail you.
on the subject of tube placement,even on a fun run, when you have so one up your ginger, the last thing you need is to be letting go of your paddle grab the tube for a drink
