I received lots of tea bags as gifts but personally I don't take much tea. So you can imagine that most of my tea bags have expired. But I don't throw them away. I keep them for other usage. One of them is to use them to clean my water bottles. The tea will get rid of the odour in the bottle.
I will soak a tea bag in my water bottle filled with plain water overnight.
The next morning, I will rinse it.
Recently, one of my suppliers gave me lots of tea-bags and I know I won't be able to finish them. So I have given them as gifts. If you like tea bags, just let me know and I will send to you.