Material: Built with lightweight yet highly impact-resistant hard plastics like ABS or Polypropylene (PP).Mobility: Equipped with independent 360-degree multi-directional spinner wheels for smooth, quiet gliding.Handles: Features adjustable aluminum telescopic locking handles along with ergonomic top and side handles.Security: Typically includes integrated TSA combination locks or side latches for travel security.Nestable Design: The sizes are designed to nest completely inside one another, making storage compact and efficient when not in use.