I agree totally with EVERYTHING in "DanO the Finicky's" excellent review!  I have owned this backpack for several years and have taken it overseas and across the US virtually every time I travel - literally traveling by land, sea or plane!  :-  I usually pack my 17" laptop in it along with its many accessories along with many other items. It holds more than any other backpack I have owned while still be able to carry it on to planes. Yet Dan0 is right - if you pack it bulging/totally ful, occasionally a stewardess will tell me it is too big and create a little bit of hassle.  But I usually can talk my way around it and, except in the smallest jets, I can get it in the overhead bin.  If not, I take my laptop out and gate check it, which still allows my wife & I to travel with only carry ons!
Have to buy a new one due to my cat peeing on it!  If not for that, I wouldn't be bying another yet and it looks hardly worn.  Bought my 1st on from Amazon, now using Amazon to buy from external vendor.  But at <$50, what a steal for such an outstanding, durable, well built rolling backpack!