I love this rucksack, I went to Aus, NZ and SE Asia with this as my only luggage, all airlines let me take it on as hand luggage provided I didn't fill the top hood compartment, it is sturdy and very hard wearing, it is just the right size as it encourages you not to take or buy lots of rubbish and so it is easy to lug around, everyone commented on my nice and light rucksack, it will forever be my favoured travel companion.
Lots of pockets make it easy to separate stuff too for ease of getting at it. I hardly ever found myself taking everything out to find something, only if I couldn't remember where I had put it, you can get to the stuff in the main compartment through the bottom compartment too which I found invaluable.
It was water proof too and held up well being man handled and shoved under some Asian buses, no rips or tears even though it was very full. The attached water proof cover is also brilliant for keeping it clean.
It was under one bus and there was fish under there too, my bag and a bunch of others got covered in slimy fish juice, but all I had to do was clean the cover and all smelling nice again.