Kontener morski and other 86,400 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
This icon for shipping container is basically a rectangle. Inside of the rectangle there are 7 vertical lines placed equidistant to one another. The rectangle has slight protrusions at each of its corners, and there is another smaller rectangle placed along its top.