SOURCE Product Reviews (Page 5)
Still, without the winter cover in both bag and tube i would not be able to use it in the mountain after a couple of hours. So, all in all it was a good and useful purchase.
I like the capacity of the bag as well; 12L is the right size for bike tools, food, and maybe an extra layer when needed. The lightweight straps give plenty of breathability without digging in.
I only wish the zippers and elastic were better quality. After about a year and a half and then the zippers start to fail and the elastic strap retainers aren't elastic any more. But, I like the bladder system so much and the overall design of the bag I will replace mine with the same anyway.