High density garbage bags have some pretty special qualities. What could be special about a trash bag? Don’t get us started. These bags have a magnificent weight-to-strength ratio, which makes them basically Superman. Made from High Density Polyethylene (HDPE for short) these bags are just 11 microns thick but are happy to shoulder heavy loads of up to 40 lbs. Just remember, sharp items are kryptonite to high density trash bags.