Sometimes my room has an odor from jackets and sweaters that I don't wash with every wash. (Not a filthy door, but the air just doesn't seem fresh). These bags are the perfect solution !! The air seems to clear up and I noticed a change within using it for 1 day. I have 2 in my room - one in my actual closet and one just in the room where I have a rolling rack of clothes (both 200g) It says you can use it up to 2 years (and you rejuvenate it with sunlight every month). I'm thinking of picking more up for my gym bag and work space if it keeps purifying the air like this !! You can pick them up at Canadian Tire or Bed Bath & Beyond.