Atlantic Infinity EX 22" Quad Wheel Carry-On Suiter (Black ) Quad Wheel system converts a 2-wheel case into a sturdy 4-wheel case with the touch of a button for maximum stability. Add-a-bag strap carries an additional bag with ease Expands a full 2.5 EZ-glide inline skate wheels for smooth rolling Removable suiter helps keep hanging garments wrinkle-free