A major advantage of plastic bags is that, when compared to other types of shopping bags, producing them carries the lowest environmental toll. The thin, plastic grocery store bags are most commonly made from high-density polyethylene (HDPE). Although production of these bags does use resources like petroleum, it results in less carbon emissions, waste, and harmful byproducts than cotton or paper bag production. Plastic bags are also relatively sturdy and reusable. Many of the studies about different bagging options that show plastic bags production demands less resources assume plastic bags are used at least twice—once coming home and once as a trash bag—and factor this into the calculations about which bags are more sustainable.
Plastic Duffle Bags are recyclable, though few people recycle them. Recycling plastic bags is a difficult task; they fly away in the recycling plant and get stuck in machinery. Because of this, many cities do not offer curbside recycling for plastic bags. Instead, large-scale retailers offer bag recycling services. However, these services are dependent on the consumer bringing the plastic bags back to the store.
Bags that are not recycled end up becoming litter, because they do not biodegrade. In addition to filling up landfills and becoming eyesores, plastic bags that become litter endanger many facets of the environment, including marine life and the food chain. This is because plastic bags, like all plastic materials, eventually break up into microscopic pieces, which scientists refer to as microplastics. Microplastics have been found nearly everywhere: in marine animals, farmland soil, and urban air.
Though scientists have only just begun studying the consequences of microplastic proliferation, and we do not yet know their effect on animals, humans, and the environment, scientists are concerned about how this level of plastic pollution could change our planet. The studies that found plastic bags to be less harmful to the environment than paper and reusable bags did not take effects of litter into account and instead assumed that the plastic bags would be recycled or used as trash bags.
Paper bags have some advantages over plastic bags when it comes to sustainability. They are easier to recycle, and, because they are biodegradable, they can be used for purposes like composting. However, paper is very resource-heavy to produce: Manufacturing a paper bag takes about four times as much energy as it takes to produce a plastic bag, plus the chemicals and fertilizers used in producing paper bags create additional harm to the environment.
Studies have shown that, for a paper Flight Bag to neutralize its environmental impact compared to plastic, it would have to be used anywhere from three to 43 times. Since paper bags are the least durable of all the bagging options, it is unlikely that a person would get enough use out of any one bag to even out the environmental impact.
Still, the fact that paper is recyclable helps lessen its impact. In 2018, 68.1 percent of paper consumed in the United States was recovered for recycling, a percentage that has been rising in the last decade. However, because paper fibers become shorter and weaker each time the recycling process takes place, there is a limit to how many times paper can be recycled.