Collapsible watercraft

1. A collapsible kayak, comprising:

a continuous sheet forming a single-piece hull having a bow portion, a midship portion, and a stern portion, the hull including a plurality of crease lines along which the hull is foldable; and

a floorboard lining the midship portion of the hull between the bow portion and the stern portion, the floorboard including a base and a pair of outboard walls pivotably coupled to the base and permanently fixed to port and starboard gunwales of the hull, respectively;

wherein the bow, stern, and midship portions are configured as a tri-fold, such that the bow portion and the stern portion of the kayak are foldable toward each other to overlap the floorboard when collapsed.

2. The collapsible kayak of claim 1 , wherein the port and starboard gunwales each comprise a respective cockpit flap connected to each gunwale at a respective fold line.

3. The collapsible kayak of claim 2 , wherein the lateral edges of the floorboard further comprises an engagement profile extending from the lateral edge of each outboard wall.

4. The collapsible kayak of claim 3 , wherein the pair of outboard walls are permanently fixed at distal ends to the port and starboard gunwales by a pair of engagement members, each of the engagement members coupled to a respective one of the cockpit flaps and a respective one of the engagement profiles.

5. The collapsible kayak of claim 4 , wherein each of the engagement members comprises a clamp extending longitudinally along a respective one of the gunwales.

6. The collapsible kayak of claim 1 , wherein the outboard walls have a larger vertical height than the port and starboard gunwales, wherein the outboard walls are configured to form an accommodating space between the outboard walls and the port and starboard gunwales when the kayak is in a collapsed configuration.

7. The collapsible kayak of claim 1 , further comprising a bulkhead oriented athwartships to close off one end of the hull.

8. The collapsible kayak of claim 7 , wherein the bulkhead is removably held in place by a tether coupled to the hull.

9. The collapsible kayak of claim 8 , wherein the bulkhead includes a pair of pivoting half-walls coupled at outboard ends to the hull, such that the half-walls are configured to meet at inboard ends to form the bulkhead when deployed and to be folded against the hull when collapsed.

10. A collapsible watercraft, comprising:

a continuous sheet forming a single-piece hull having a plurality of creases at which the hull is foldable to selectively deploy and collapse the watercraft, the continuous sheet comprising a pair of folded flaps, each extending from a respective one of the port and starboard gunwales of the hull;

a closed prow at a bow end of the hull and a closed transom at a stern end of the hull;

an integrated floorboard disposed at a midship section of the hull, the floorboard comprising a base portion pivotably coupled to a pair of sidewalls, each sidewall comprising

an engagement profile extending from a respective sidewall; and

a pair of engagement members each permanently coupling a folded flap of the pair of folded flaps to a respective engagement profile;

wherein the bow end and the stern end are foldable at respective creases forward and aft of the floorboard to overlap the midship section such that the closed prow and closed transom nest together over the floorboard.

11. The collapsible watercraft of claim 10 , wherein each engagement member comprises a longitudinally extending clamp.

12. The collapsible watercraft of claim 10 , wherein the sidewalls have a larger vertical height than the port and starboard gunwales, and wherein the sidewalls are configured to form an accommodating space between the sidewalls and the port and starboard gunwales when the watercraft is in a collapsed configuration.

13. The collapsible watercraft of claim 10 , further comprising a bulkhead oriented athwartships to close off one end of the hull.

14. The collapsible watercraft of claim 13 , wherein the bulkhead is removably held in place by a tether coupled to the hull.

15. The collapsible watercraft of claim 13 , wherein the bulkhead comprises a pair of partial walls pivotably coupled to the hull, wherein the partial walls are configured to form the bulkhead by pivoting into contact with each other when deployed and to pivot against the hull when collapsed.

16. A method of using a collapsible kayak, the method comprising:

releasing one or more temporary fasteners holding a collapsible kayak in a deployed configuration to cause port and starboard gunwales of the kayak to be moveable in an outboard direction, wherein the kayak has a midship section including an integrated floorboard permanently coupled at distal edges to an outer hull of the kayak at the port and starboard gunwales, the outer hull formed by a continuous sheet;

folding a first end of the hull of the kayak at a first crease toward a second end of the hull, such that the first end overlaps the integrated floorboard such that an accommodating space is formed between the integrated floorboard and the gunwales; and

folding the second end of the hull at a second crease to overlap the first end of the hull.

17. The method of claim 16 , further comprising:

after folding the first and second ends of the hull at the first and second creases, folding the port and starboard gunwales of the kayak toward each other to form a portable box.

18. The method of claim 16 , further comprising:

stowing one or more accessories of the kayak within the accommodating space formed between the integrated floorboard and the gunwales.

19. The method of claim 16 , wherein the floorboard is disposed between the first and second creases.

20. The method of claim 16 , further comprising:

untethering a bulkhead of the kayak from the hull and removing the bulkhead from the kayak.