Having tried lots of other bags this is perfect for travelling- carries everything I need with room for midlayer or shell in the top.
Not too big so easy for flights etc.
The load lifters and optional waist belt makes it comfortable for treks
The only (small) negative is the chest strap can be fiddly to engage.
I have a PRVK 4 that is bigger and also great but found that I am always using this instead.