Material: Often described as "pure rubber" or high-quality polypropylene, which is chosen for its durability and impact resistance.
Mobility: Equipped with 360-degree double spinner wheels (often 8 wheels in total) for easy movement.
Security: Features frequently include anti-theft double zippers and built-in 3-digit combination locks.
Design: The hard-body construction is often waterproof and scratch-resistant, designed to handle rigorous travel.