As this company is a shipping company. I thought that I should focus on something look-alike packaging. I noticed that If I combine a box(as the box is used for delivering something) with 'Letter - C' will be an excellent concept.
And the result is here! Also, as they are going to use the logo on team member's apparel, and on their trucks, that's why I made the logo mark with simple shapes. Which can be easily print/embroidered anywhere they want.