| CPC B65D 90/08 (2013.01) [B60P 3/221 (2013.01); B60P 3/2225 (2013.01); B65D 88/127 (2013.01); B65D 90/024 (2013.01); B65D 88/06 (2013.01); B65D 90/16 (2013.01)] | 22 Claims |

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1. A method of manufacturing an obround cargo container, the method comprising:
providing a plurality of longitudinal panels formable into an obround shell having a transverse cross section with an obround shape, the panels comprising:
rigid curved panels formable into a cylindrical shell, each curved panel comprising a cylinder segment of the cylindrical shell; and
at least two rigid, flat extension panels;
forming the obround shell from the panels;
forming at least one collar conformably encompassing the obround shell;
constricting the at least one collar to compress longitudinal joints formed at abutting edges of pairs of adjacent panels; and
welding respective joints of pairs of the panels.
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