All pieces are made of 600 x 600D Polyester. In-line skate wheels made of polyurethane minimizes friction for smooth rolling. Push button handle locks when fully extended. Top and side carry handles for convenient lifting. Multiple interior and exterior pockets keep you organized. Interior also has compression straps to help keep items in place. Reinforced corners help protect from hard travel conditions. Boarding bag dimensions: 10" x 15" x 6.5". 21" Upright dimensions: 21" x 14" x 7". 25" Upright dimensions: 25" x 16.5" x 8".