| CPC B63B 32/56 (2020.02) [B63B 32/40 (2020.02); B63B 32/51 (2020.02)] | 20 Claims |

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1. A convertible stand-up paddle board, comprising:
a main body member defining an aperture, wherein the aperture is defined by an upper portion having a first transverse dimension and other portions having a second transverse dimension, at least a portion of the first transverse dimension being smaller than at least a portion of the second transverse dimension;
a panel fixed to the main body member and covering a bottom end of the aperture; and
a seat assembly disposed in the aperture, the seat assembly having a seat portion and a backrest portion, wherein the backrest portion is movable between a folded position and an upright position, and wherein at least a portion of the transverse dimension of the seat assembly corresponding to the upper portion is larger than the at least a portion of the first transverse dimension such that when the backrest portion is in the folded position the seat assembly is positively retained in the aperture by interference between the upper portion and the at least a portion of the transverse dimension of the seat assembly.
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