Cargo carrier

1. A rooftop cargo carrier, comprising:

a base having a trough shape with an interior space for stowing goods to be transported therein;

an openable and closable lid hingedly coupled with said base; and

an add-on portion that at least partially extends outside of said base and said lid when said lid is in a closed state,

wherein said add-on portion is attached to at least one of said base and said lid for enlarging an overall external volume of the cargo carrier,

wherein said add-on portion is added to an outer surface of at least one of said base and said lid, and

wherein said add-on portion comprises a bridging portion that provides a transition between said outer surface of said lid and said outer surface of said base when said lid is in said closed state.

2. The rooftop cargo carrier according to claim 1 , wherein:

said interior space is accessible through an upper opening defined by a rim portion of said base,

said openable and closable lid is adapted to be positioned in said closed state with an edge portion of said lid contacting said rim portion, and

said bridging portion provides a transition between said edge portion of said lid and said rim portion of said base, when said lid is in said closed state.

3. The rooftop cargo carrier according to claim 2 , wherein said rim portion comprises a U-shape,

wherein in said rim portion a wall portion of a side wall of said base is curved outward and over onto itself such that an edge portion of said side wall protrudes downwards, and

wherein a gap is formed between the downwardly protruding edge portion and a portion of said side wall of said base.

4. The rooftop cargo carrier according to claim 1 , wherein said bridging portion provides a flush transition between an outer surface of said bridging portion and said outer surface of said lid or between the outer surface of said bridging portion and said outer surface of said base when said lid is in said closed state.

5. The rooftop cargo carrier according to claim 1 , wherein said bridging portion comprises a frame surrounding said base.

6. The rooftop cargo carrier according to claim 1 , further comprising fixation members for fixing the rooftop cargo carrier to a vehicle.

7. The rooftop cargo carrier according to claim 1 , wherein said bridging portion provides a flush transition between an outer surface of said bridging portion and said outer surface of said lid, and between the outer surface of said bridging portion and said outer surface of said base when said lid is in said closed state.

8. The rooftop cargo carrier according to claim 1 , wherein said add-on portion comprises a spoiler portion attached to said lid.

9. The rooftop cargo carrier according to claim 8 , wherein said spoiler portion comprises a gripping portion for handling the cargo carrier.

10. The rooftop cargo carrier according to claim 8 , wherein said spoiler portion provides a flush transition between an outer surface of said spoiler portion and an outer surface of said bridging portion.

11. The rooftop cargo carrier according to claim 10 , wherein said base or said add-on portion comprises at least two ground contact sections for supporting the cargo carrier on a substantially level ground.

12. A rooftop cargo carrier, comprising:

a base having a trough shape with an interior space for stowing goods to be transported therein;

an openable and closable lid hingedly coupled with said base; and

an add-on portion attached to at least one of said base and said lid for enlarging an overall external volume of the cargo carrier,

wherein said interior space is accessible through an upper opening defined by a rim portion of said base,

wherein said openable and closable lid is adapted to be positioned in a closed state with an edge portion of said lid contacting said rim portion, and

wherein said add-on portion comprises a bridging portion attached to said base or to said lid and formed to provide a transition between said edge portion of said lid and said rim portion of said base, when said lid is in said closed state.

13. The rooftop cargo carrier according to claim 12 , wherein said add-on portion at least partially extends outside of said base and said lid when said lid is in said closed state.

14. The rooftop cargo carrier according to claim 12 , wherein said bridging portion provides a flush transition between an outer surface of said bridging portion and the outer surface of said lid or between the outer surface of said bridging portion and the outer surface of said base when said lid is in said closed state.

15. The rooftop cargo carrier according to claim 12 , wherein said bridging portion comprises a frame surrounding said base.

16. The rooftop cargo carrier according to claim 12 , wherein said rim portion comprises a U-shape,

wherein in said rim portion a wall portion of a side wall of said base is curved outward and over onto itself such that an edge portion of said side wall protrudes downwards, and

wherein a gap is formed between the downwardly protruding edge portion and a portion of said side wall of said base.

17. The rooftop cargo carrier according to claim 16 , wherein an upper edge portion of said bridging portion is accommodated in said gap.

18. The rooftop cargo carrier according to claim 17 , wherein said upper edge portion of said bridging portion comprises two supporting sections being supported oppositely against said wall portions defining said gap.

19. The rooftop cargo carrier according to claim 17 , wherein said upper edge portion of said bridging portion is double-curved.

20. The rooftop cargo carrier according to claim 17 , wherein said upper edge portion of said bridging portion is bonded to said wall portions defining said gap.