bin bags is the rather soft and flexible LDPE (low-density polyethylene) or, for strength, LLDPE (linear low-density polyethylene) or HDPE (high-density polyethylene) are sometimes used. Biodegradable plastic bags Oxo-biodegradable plastic bags have the same strength as ordinary plastic and cost very tiny extra. They will degrade then biodegrade if they get into the open environment, but they can be recycled if collected during their useful life. They are designed so that they will not degrade deep in landfills and will not, therefore, generate methane. Oxo-biodegradable plastic does not degrade quickly in low temperature "windrow" composting, but it is suitable for "in-vessel" composting at the higher temperatures required by the animal by-products regulations. Oxo-biodegradable plastic is bio-assimilated by the same bacteria and fungi, which transform natural material such as twigs and leaves to cell biomass, like lignocellulosic materials. Oxo-biodegradable plastic is designed to degrade initially by a process that includes both photo-oxidation and thermo-oxidation, so it can degrade in the dark. Resin identification code 7 is applicable to biodegradable plastics. People tend to use garbage bins to dispose off these plastic covers or bags from their home making the environment safe from the enormous chemicals and other poison substances that can be caused from the dumping of these bags. The main cause of environment pollution is the carelessness of the people that later on affect the environment drastically and making it unsafe for the living habitat. Usage of garbage bins to remove these types of bags and plastics can help restore balance to the environment. Drawstring and flexibility In 1984, drawstring garbage bags first appeared before GLAD and Hefty introduced them. In August 2001, Hefty introduced the garbage bags with a drawstring designed to stretch around the garbage can's rim and stay in place. In July 2004, ForceFlex, the flexible plastic garbage bags, was introduced by GLAD (followed by Hefty's Ultra Flex brand in September). See also Blue bag Packaging Plastic bag Plastic recycling Thermal depolymerization, post consumer waste processing technologies References Books Brody, A. L., and Marsh, K, S., Encyclopedia of Packaging Technology, John Wiley & Sons, 1997, Selke, S, Packaging and the Environment, 1994, Selke, S,. Plastics Packaging, 2004, Bags Canadian inventions Plastics Waste containers