Question about Osprey Fairview 55

The dimensions of the Osprey Fairview 55 backpack are typically given for the main pack without the daypack attached. The main pack's dimensions are 55 cm x 35 cm x 23 cm (22 inches x 14 inches x 9 inches) . When the daypack is attached, it may exceed typical carry-on size limits, so it's best to check with your airline for specific carry-on requirements. The daypack itself can fit under the seat as carry-on luggage .