Tomwrote a review of Grivel Mago Bag on September 19, 2014
Familiarity: I've used it several times
I really have enjoyed this pack on my last few multipitch climbs. First off, I hate wearing a pack while climbing. I think it gets in the way and makes you off-balance. While wearing the Mago I barely notice that it is on, it does not interfere with gear loops, and is big enough to hold what I need. I have found the straps to be comfortable and easy to get on and off.
The only thing I wish I had done was not been cheap and got the 14L. The 12L works but and extra 2 liters would be nice.