I've done a lot of miles with the Raid Light Endurance this year and have finally fallen out with it.
Features are great andit is compatible with the RL strap mounted bottle holder.
The issue I have is that it is so damn heavy, compared with a Last Drop for instance.
I have just got an OMM iDrate from Blands (£10 cheaper than most other spots) which is 12 litre capacity, separate pocket for bladder (which is not next to the back panel and is my preferred option for long alpine races where refilling the bladder is a must), 2 big mesh pockets and 2 waist zipper pockets. Lightweight fabric and feels about half the weight of the Raid Light (though I'm sure its not).
I also got the OMM bottle holder which attaches just the far side of the waist pocket and is a much subtler and lighter contraption than the RL integral version
Off to the Alps at the weekend so it will get a good testing, including in the Marathon du Mont Blanc on 27 June.
Happy to report back later!