Overhead bins are optional. The Halfday Convertible Cabin Bag packs like a suitcase thanks to its clamshell design and dual compartments, yet it's sized to fit under the seat on most domestic flights. Four carry modes let it shift from backpack to briefcase to shoulder bag in seconds, while a dedicated laptop compartment keeps your tech within easy reach. At just 2.9 pounds, it's a versatile carry-on built for travelers who'd rather spend less time boarding and more time moving.