Abstract: A filter, in particular a pocket filter for filtration in air systems and devices, comprises at least one filter pocket, which is formed by folding a filter medium. A method for producing a filter, in particular a pocket filter for filtration in air systems and devices, comprises forming at least one filter pocket by folding a filter medium over a self-contained folding edge. A filter, in particular a pocket filter for filtration in air systems and devices, is also provided, which comprises a filter pocket made of a filter medium, wherein the filter pocket is self-contained and wave-shaped.