BOS Born From Medical Development. Poop odor that people feel most sensitive. BOS is a material with incredible odor resistance that virtually does not feel the odor even if you put it in and leave it for a while. Easy to use, just tie and dispose of! No need to double the bag or flush it into the toilet, BOS is okay. BOS deodorizing performance is very good, but it is not completely protected. When sealed with a bucket or other similar airtight it may cause a slight leakage of odor in the bucket, and you may feel the smell.