Carry on luggage is very popular, since it remains with the traveler throughout the trip, rather then being checked into the baggage area. There can be one, two or even three pieces, depending on the size of the bag, length of the trip and rules or restrictions of the airline. Duffel, backpack or messenger bags can be tucked underneath a seat and can contain everything from reading material and medication, to a laptop computer and cell phone. Larger carry on luggage pieces, which are typically stored in an overhead compartment, can hold clothing, shoes, accessories and more. Those traveling for business may make use of a garment bag. It can keep several suits, dresses or coats wrinkle-free upon arrival, since garments remain on the hanger and are generally folded in half. Lightweight bags and luggage with hand grips make lifting and carrying efficient when storing on the plane. Multi-directional wheels and telescoping hand-pulls simplify long walks from the car to the gate.