4-piece travel bag set - durable polypropylene 4-piece travel bag set - durable polypropylene Made of break-resistant polypropylene (PP) material, to provide high protection against shocks. Double 360-degree rotating wheels provide smooth movement and ease of navigation on various surfaces. Durable main zipper enhances security and protects luggage. Expansion zipper to increase storage capacity when needed. Internal dividers and pockets help organize luggage practically. Multi-level telescopic pull handle for greater comfort during use.