NOVELTY - The composter barrel (200) comprises a first panel having a first complementary structure, a second panel having a second complementary structure, and a connector element configured to connect the first and second panels together without the use of fasteners by engaging the first and second complementary structures. The first and second panels comprise a side panel (204) configured to be connected to another side panel, and an end panel (202) having an opening configured to receive a shaft. Each first and second panel includes an additional complementary structure.    USE - The barrel is useful in a composter (claimed).    ADVANTAGE - The portable barrel exhibits lightweight and increased corrosion resistance, can be rapidly and easily disassembled without damage of panel, and facilitates airflow through the interior of the composter.    DETAILED DESCRIPTION - The composter barrel (200) comprises a first panel having a first complementary structure, a second panel having a second complementary structure, and a connector element configured to connect the first and second panels together without the use of fasteners by engaging the first and second complementary structures. The first and second panels comprise a side panel (204) configured to be connected to another side panel, and an end panel (202) having an opening configured to receive a shaft. Each first and second panel includes an additional complementary structure configured to engage the connector element. The connector element is configured to releasably engage the first and second complementary structures of the first and second panels. The composter barrel further comprises four additional panels configured to be connected with the first and second panels by additional connector elements. The six panels are configured to be connected together to form a generally cube-shaped barrel. One of the panels includes interior and exterior surfaces that are spaced apart from each other and partly define a hollow interior portion. An INDEPENDENT CLAIM is included for a composter.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic perspective view of a composter.    Barrels (200)    First and second end panels (202)    Side panels (204)    Frame (300)    Adjustment mechanism (400)    Handle mechanism. (500)