Read this article and you will never throw away already used tea bags.
Used tea bags still have antioxidant properties which can be used in many functions.

See Why You Should Never Throw Away Used Tea Bags Again

1. Keep your garden healthy

You can water your plants with water, where previously you have put the used bags. This ways you will get weak tea, which will protect the plants from fungal infections.
Also you can open the bags and pour the leaves from the tea on the soil. The soil will be fertilized.

2. Get Rid of Eye Redness

Just put the used tea bags in cold water for 2 minutes. Place them on your eyes. Let it rest for a couple of minutes. The skin will absorb the antioxidants and the redness will be gone.

3. Freshen Your Clothes and Shoes

Dry used tea bags and store them with your clothes in the closet. The clothes will smell fresh. Also, you can put tea bags in your shoes to eliminate the unpleasant odors.

4. Clean Your Home

Boil a couple of already used tea bags in a liter of water. Let it cool down. You can clean dirty mirrors, floors or even linoleum.

5. Get Rid of Acne and Mitigate Sunburns

Just place used tea bag on the acne or on the area where you have sunburns. You will get quick relief.
Black tea bags are excellent for sunburns, and teabags from green tea are good for the acne.

6. Relieve bleeding gums and sores

To stop any kind of bleeding in your mouth just bite already used tea bag. You can soak it in cold water and tea compounds will relieve the pain and stop the bleeding.