length of fishing box 10 is defined as the portion of fishing box 10 along which it is most likely that the longitudinal position of the center of gravity of fishing box 10 be located considering usual weight repartitions within the fishing box and considering that the fishing box may have different weight repartitions according to the number of casings 22 24 that are attached to container 12 that is to say fishing box 10 is likely to have the longitudinal position of its center of gravity located at different positions depending on the following factors a are the casings 22 and or 24 attached to container 12 and b how is the load spread inside container 12 and eventually casings 22 and 24 if they are attached to container 12 considering that a normal loading of fishing box 12 will see the load more or less equally longitudinally spread in each casing 22 24 and container 12 proportionally to the available area per unit of length of each casing container then the presence or absence of casings 22 24 will influence the longitudinal position of the center of gravity of box 10 if both casings 22 24 are not installed on container 12 then the longitudinal position of the center of gravity of box 10 will probably be located at the container first end portion 12 a and more particularly probably not further away from container intermediate portion 12 b than half the length of container first end portion.