However, the biodegradable, oxo-biodegradable and conventional plastic formulations remained functional as carrying bags after being in the soil or the marine environment for over three years.Biodegradable plastic bags can still carry load after 3 years in soil, sea.Imogen Napper, who led the study, said: "After three years, I was really amazed that any of the bags could still hold a load of shopping. When you see something labelled in that way, I think you automatically assume it will degrade more quickly than conventional bags.. After nine months in the open air, all the plastic bag materials had completely disintegrated into fragments. But, after three years at least, our research shows that might not be the case.The research published in Environmental Science & Technology examined the degradation of five plastic bag materials widely available from high street retailers in the United China commercial pvc floor roll Manufacturers Kingdom. The compostable bag completely disappeared from the experimental test rig in the marine environment within three months.Many of these items are known to have entered the marine environment, with previous studies having explored their impact on coastal sediments and shown they can be broken down into microplastics by marine creatures. 

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