I have the Carry-on 2.0 and used it extensively this last winter as I traveled to San Francisco every week. On one particularly brutal week of hotel prices, I opted for an AirBnB next to Alamo Square Park. After a full day of travel and working downtown, I opted to walk to my home for the week … all 2.9 miles of the uphill trek. My pack was heavy, because it holds a lot and I hadn't yet learned how to be chill when I pack for the week. I was a little tired at the end of my hike, but I wasn't weary. The hip pads are a must. The pads plus the strap adjustment on the bag let me put the weight where it belonged. I was able to keep this bag beneath the seat in front of me on my domestic flights. It sticks out a little, but I didn't mind, and it was great not to fight for overhead bin space.
So … why only 4 stars? I save 5 stars for perfect; there are a couple nitpicks that have me pause when I decide which bag to pack. The first, and this is minor, is the bottle holder. It does its job of holding a bottle, but it's just a little weird with the elastic strap and the pocket that holds less bottle than you would think it should. The second is that once I've emptied the bag of clothes and other travel stuff and headed back to the office, it doesn't sit well. When I set the bag next to my desk it buckles under its own weight. This is annoying enough that it I have packed the Daily Bag inside so I have it for the day. However, it's a trade-off to do this. My answer was to pack less and only use the Daily Bag for weekly travel. I save the Carry-on 2.0 for bigger trips, and even then, I'm taking the daily bag with the should strap attached.
If the Carry-on 2.0 could be my daily bag, too, I would give it 5 stars. Besides that, it's perfect in every other way. Believe the other reviews!