Porter Case manufactures airline carry-on size hard-side, wheeled cases to house your laptop, photography gear, projectors, as well as clothes. The real value comes from the patented "CASE to CART" conversion feature that allows you to convert your rolling case into a cart to carry 200 plus pounds of additional luggage and gear right on top of your Porter Case. No more looking for a Skycap, airport cart rental, or Bellman. No more tipping. Porter Case is an invisible CART, a protective carry-on, even a seat. It works equally well with trains, planes, ships or autos. With Porter Case your cart is always there. . . when you need it.