I was looking for a bag rather than a backpack but was able to take a personal item on the flight. I took this bag on a 5 day trip and was able to fit everything I needed. I stuffed it as far as I could and it still fit under the seat in front of me. I say 1. It was crowded and 2. If you travel on United Economy (or any other airline with the same rules) they check your bag before they let you check in. The rep who checked me in said it was iffy but let me go anyway. Also, different airlines/planes have different sizes of space under the seats in front of you. The American has about 6 inches more room than the United, making carrying this bag much easier. Photos are included below.
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