I reviewed the trash cans after subdividing the household trash. I first bought a 20-liter can, and then I bought a 12-liter can because I was satisfied with the 20-liter can. The 20-liter can is for temporary storage of cans, bottles, and PET bottles, and the 12-liter can is for burnable trash. I'm going to start using a compost bin for food scraps, so even for a family, these sizes are sufficient. The most common type of plastic waste is bulky, so I'm using a 70-liter bag in a large cardboard box for the time being. If Nitori made a good trash can for plastic waste, I'd buy it immediately.