Over 20 unique features The best-selling carry-on backpack is back & better than ever – with all new accessories designed to help you enjoy the journey, and stress less. 35L or 45L packing capacities that are both carry-on friendly for most airlines Expansion pocket adds ...Over 20 unique features The best-selling carry-on backpack is back & better than ever – with all new accessories designed to help you enjoy the journey, and stress less. 35L or 45L packing capacities that are both carry-on friendly for most airlines Expansion pocket adds additional packing space Dual-compartment clamshell interior for an organized pack Perfect for overnight, business travel, weekend trips, and week-long trips Build your perfect travel system with the 15L Everyday Bag, Clip-in pouches, and Packing Cube Set (sold separately).