Not that it’s not cool to make something from scratch on your own, but think about how much time and energy it would take while the alternative is letting this shipping container mockup do the hard work and leave you but a simple drag and drop!
Make all the customization you wish, from changing the background to that of the color scheme till it suits you to a T. That’s your call. What’s more, it’s available for free; you would know it’s RB tradition to offer all it has free of charge if you’re a regular visitor! Now, head over to check the rest to add to your treasure trove of graphic assets!