Holds enough gear for a 2 week trip. Nice to have it all in one place when going through airport security and the like.
A tad cumbersome when being carried or trying to stuff into the overhead with all the straps flopping about, but when it is on your back, it's a dream. Works so well when on that I have actually forgotten it's size and tried to sit in a chair.
Much much better then a shoulder bag (crush your lower vertebrae in a motorcycle accident and you get sensitive to these things).
Have not mastered the tripod attachment and gave up since I rarely take them when we travel overseas anyhow.
Would be nice if the laptop carrier was a bit wider but it does ok.
Over the years I have collected a fair amount of shoulder bags and backpacks. Without a doubt this is be best bag I own.