Linear Low-Density Polyethylene (LLDPE), is the material used most commonly for trash bags in Canada. It has the best tear resistance, and is made from either virgin material, recycled plastics, or a combination of both. Some bags made from recycled material have a green certification, such as EcoLogo or Green Seal. Most of these bags have flat bottom seals and are made in multiple thicknesses and sizes to satisfy different requirements.