I avoid plastic because they all tend to disrupt the environment in a serious way. They get into soil and slowly release toxic chemicals. They eventually break down into smaller pieces but sometimes kill animals who eat them and can die. Some poly-mailers claim to be biodegradable, but generally plastic takes between 20-1000 years in landfills to break down depending on thickness and composition. I will always strive to avoid new plastic and use recycled products or cardboard since it is 100% bio-degradable.