If you want to know why I chose this bag over the Perigree, head over to the reviews for Perigree! Once I decided to go with the Nova as a personal item on my Spirit airlines flight with 18"x14"x8" restrictions, the real test was actually traveling with it. I used the front stash pocket to place travel-sized liquids so it would be easy to access for TSA screening. I used the sunglasses/goggles pocket for my huge RFID-proof wallet, passport, boarding pass, etc., again easy to access. My phone went into one of the organization pockets, keys I knew I wouldn't need for a week went on the little red hook in the organization pocket. I didn't take a laptop on this trip but it would have been easy to access without disturbing other contents in my pack if I had. I still don't understand the water bottle comments. I took the Nova on a test run with my 12oz standard mouth HydroFlask. I traveled with my 21 oz standard mouth HydroFlask. Full liters of water fit in the side pockets (much wider than any wide mouth HydroFlask, except maybe the 40 oz or larger) and the only time a water bottle fell out, I know it wasn't all the way in the pocket. Maybe I'm not bending over as much as everyone else. Anywho, once on the plane, to make sure my bag fit, I stashed my toiletries bag and water bottle into the main compartment and it fit under the seat in front of me just fine, although 2 of the 3 the dimensions of the Nova are listed as larger than the dimensions of Spirit Airlines. But like Kristine, I didn't have a fully packed bag for this trip - by design and because i really didn't need to. For reasons that will be left on Yelp and Trip Advisor, I ended up on JetBlue flights that got me to my actual destination. JetBlue's personal item requirements are even smaller than Spirit's (17x13x8) and my pack still fit. JetBlue doesn't charge for carry-ons so I still would have been ok. Too bad I didn't have the presence of mind to take a photo of my pack on the JetBlue flight.