【4-Piece Luggage Set】Includes 20’’ carry on luggage + expandable duffel bag + toiletry bag + large cosmetic case, all with a 4-YEAR WARRANTY and backed by a 90-DAY RETURN POLICY 【Aerospace-Grade Hybrid Durability】ABS+PC composite shells (identical to 6-piece set) absorb impacts 3X better than standard ABS. Corner guards survive 8,000+ collision tests 【TSA-Approved Security & Smooth Zippers】Same one-touch TSA locks and reinforced SBS zippers as premium set. Seam-sealed construction prevents bursts 【4 Silent Spinner Wheels + Ergonomic Handle】360° silent wheels glide effortlessly on carpets/cobblestones (15kg load tested). 3-stage telescopic handle with comfort grip 【Smart Organization + Expandable Storage】Duffel bag: Isolated wet/dry compartments (+20% capacity), attaches via trolley sleeve. Toiletry bag: Compact essentials. Cosmetic case: Large multi-pocket design