A cardboard box is a bunch of rectangles that combine together folding it to mold it as one to make it into a container. On the sides there are small slits that have a handle to grasp it on, these are lines that come to a point in the top-middle of the side rectangles.
Related to Cardboard Box Icon
Related icons are the icons with matching tags, as well as all ecommerce icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors