High density trash bags have a different manufacturing process than low density trash bags, making them thinner and not as puncture resistant. However, they can still carry very heavy loads that are not rough-edged such as clothing, towels and dirt.
High density bags are a great choice for office and restroom waste, shredded paper and in public areas where sharp trash is not deposited.
High density bags are most often measured in microns, which is one thousandth (.001) of a millimeter.