A 10kg package’s physical size varies greatly depending on what’s inside and how it’s packed. For dense items like books or metal parts, a 10kg box might measure approximately 30cm x 30cm x 30cm (12″ x 12″ x 12″). For lighter, bulkier items like clothing or pillows, the same weight could fill a box measuring 50cm x 40cm x 40cm (20″ x 16″ x 16″) or larger. Couriers often use volumetric weight calculations, charging based on whichever is greater: actual weight or dimensional weight (length x width x height ÷ 5000 for cm). This means a large but light package could be charged as if it weighs more than 10kg. When shipping, it’s important to pack efficiently to minimize dimensional weight charges while ensuring items are properly protected.