One bag for the commute and for the flight.

Monday it carries a laptop and a lunch. Thursday it has to hold three days of clothes and still fit in the overhead bin. Most people solve that with two bags and a decision every time they pack.

It expands when you need it and goes back to its normal size when you don't. Underneath there are two patents: a magnetic closure that keeps the zippers covered while you wear it, and a pulley in the straps that lets you drop one shoulder and bring the bag to the front without taking it off.

Built in military-grade ballistic nylon, engineered against abrasion and friction.