Masks are lightweight but voluminous, meaning you will likely be charged based on volumetric weight. Use double-walled corrugated export cartons to prevent the inner 3M retail boxes from being crushed, as damaged packaging can lead to customs rejection or buyer distrust. For urgent medical needs, Air Freight is preferred, but for cost-efficiency in industrial supply, LCL (Less than Container Load) sea freight is the standard, provided the warehouse is climate-controlled to prevent humidity from affecting the electrostatic filter media.