When you buy a new Dopper, it can be possible that there's a little bag with activated carbon in it. This bag will, after the production, neutralize smell in the Dopper.
The activated carbon is a substance made from carbon of plants and other organic materials. Activated Carbon is also used for water purification or medicine.
This activated carbon bag is certified, by the EU regulations, for products that will have contact with food. This bag does not harm you or your Dopper. You can just place the bag in your trash can and enjoy your new PET-Free soulmate!