The ornamental design for a multi-rider flotation inner-tube, as shown and described.
FIG. 1 is an isometric view of a multi-rider flotation inner-tube having features in accordance with the present invention;
FIG. 2 is a front elevational view of the multi-rider flotation inner-tube of FIG. 1, it being understood that the additional elevation views taken from vantage points rotated 120 degrees and 240 degrees are identical thereto;
FIG. 3 is a rear elevational view of the multi-rider flotation inner-tube of FIG. 1, it being understood that additional elevational views taken from vantage points rotated 120 degrees and 240 degrees are identical thereto;
FIG. 4 is a top plan view of the multi-rider flotation inner-tube of FIG. 1, having features of the present invention; and,
FIG. 5 is a bottom plan view of a multi-rider flotation inner-tube of FIG. 1, having features of the present invention.