30ml 50ml 100ml Dual-Layer AS Airless Bottle for Serum Packaging(MC-299) Product Description Serum formulas often combine concentrated active ingredients with lightweight textures, making packaging selection an important part of product development. This dual-layer airless bottle is designed around the needs of serum packaging, using a PP inner container for direct product contact and an AS outer bottle for structural support and premium appearance. The airless dispensing