I can fit a week's worth of clothing on this bag and it fits on every airplane. If you really stuff it it full it fits under the seat in the smaller airplanes and up top on the larger ones. If you travel frequently by air this is a great alternative to a roller bagGreat for backpack travel ?A well-executed, if not well-designed (for my travel lifestyle). What might be the perfect pack for some, is a big miss for others. I have the 35L and the 45L packs, but wish I wouldn't have spent the money. Online shopping and you don't know until you try I guess. I have an ipad and a 13"laptop, but the specialized laptop sleeve is too short to fit them. The rubberized outer material will "stick" to the overhead bin plastic and make it harder to shove in there. I don't like the 50/50 suitcase style packs (didn't know that until I used them awhile). Not enough dedicated zippered pockets. Headphones, camera, passport wallet, keys, pen, journal, earplugs, eyemask, waterbottle, snacks, kindle, etc. all had mostly separate places in my previous pack and I was better organized. I hope to sell them both on ebay, and it's back to the drawing board.We'll see how long it lasts, but so far this is the best travel bag I have found. The laptop insert is small, so don't expect a 15+ to fit, but otherwise this pack is brilliant.I won’t travel without it. Holds everything you can imagine and very ergo friendly to carry. Get it!Used this bag for a 12 day trip to Europe and it held everything I needed. Fantastic bag, and was incredibly easy to get around with. Used as Carry on with no issues.I got this for one-bagging while flying and it has been great on the three trips I've had it on. Plenty of space for me to pack all of my clothes, electronics, and toiletries for a week long trip. The inside organization helps keep smaller things easy to find and the larger areas fit packing cubes very well. I like the burly construction and the material, though it isn't waterproof, helps keep things dry if you get caught in the rain.One important note: I have used it on budget airlines as my personal item before when I don't want to pay for a carry-on bag. Most of the time it has been fine but there was one gate attendant who almost didn't let me take it on without paying because I had to squish it to fit in the box they use to check the size of your bags. If you're flying one of these airlines just be sure not to completely stuff it or go with the 28L size instead.I spent a week in London and Paris over Christmas with the transportation strike going on in Paris. Because of this, I ended up walking to all but 2 of my destinations, with all of my belongings. The pack was durable and the way the interior is separated made for even distribution of all of my junk. I even found a couple of secret pockets that I didn't realize I even had. I found so much room throughout my travels that I emptied out the "carry on" bag I brought with and stored everything including that "carry on" bag in this pack! Even stuffed to the gills, I was able to get it into the compartment on the airplane. The multiple handles on the exterior allow you to carry it whichever way is convenient at the time. I like it so much that I'll be replacing my Patagonia sling bag for one of their smaller 20L packs. I am an organizational junkie and everything had a place in this pack. I would give more stars if I could. You won't be disappointed.My daughter-in-law loves this pack. Great quality!Es für einen Tage Trip genau die richtige Größe, viele Fächer und Stauraum absolut super, ein wenig weniger bunt wäre auch ok