NOVELTY - Complete anaerobic degradation of polymer mixtures of a composition, is claimed, where the composition comprises: (a) 25-95 wt.% of polyhydroxyalkanoate consisting of poly-4-hydroxybutyrates, poly-3-hydroxybutyrates, poly(3-hydroxybutyrate-co-3-hydroxyvalerates), poly(3-hydroxybutyrate-co-3-hydroxyhexanoates) and poly(3-hydroxybutyrate-co-4-hydroxybutyrates); and (b) 5-75 wt.% of an aliphatic polyester.    USE - The method is useful for: complete anaerobic degradation of polymer mixtures of a composition and of packaging for organic goods; and disposing organic goods in a biogas plant, where the polymer mixtures are useful for producing films (all claimed) and tapes for nets and fabrics, and the films include tubular films and chill-roll-films.    ADVANTAGE - The produced films exhibit excellent tear resistance and good anaerobic degradability.    DETAILED DESCRIPTION - Complete anaerobic degradation of polymer mixtures of a composition, is claimed, where the composition comprises: (a) 25-95 wt.% of polyhydroxyalkanoate consisting of poly-4-hydroxybutyrates, poly-3-hydroxybutyrates, poly(3-hydroxybutyrate-co-3-hydroxyvalerates), poly(3-hydroxybutyrate-co-3-hydroxyhexanoates) and poly(3-hydroxybutyrate-co-4-hydroxybutyrates); and (b) 5-75 wt.% of an aliphatic polyester containing 65-100 mole% of succinic acid or its derivative, 0-35 mole% of an aliphatic 5-36C-dicarboxylic acid and a corresponding acidic derivative or a mixture, 98-100 mole% of a 2-8C-alkylene diol or 2-6C-oxyalkylene diol and 0-2 wt.% of at least one polyfunctional compound containing at least two isocyanate-, isocyanurate-, oxazoline-or epoxide groups or at least three alcohol-or carboxylic acid groups. An INDEPENDENT CLAIM is included for disposing organic goods in a biogas plant, comprising collecting or pouring the organic goods in a package, collecting the organic goods in the package of a waste disposal company, and supplying the organic goods in the package of an anaerobic fermentation in the waste disposal company.