Second-hand tea bags are fine.
In fact tea bags are an excellent example of the squandering of the planets' resources. Don't you know.
The average tea bag (with lots of dunking) can brew up to 10 cups of tea depending upon dark or light colour, according to ones taste.
Sharing of tea bags has become a modern day expression of friendship and endearment, so you, Tyke, must be billy no mates!
It also means less kettles boiling so less global warming.
And no,dozy rozy,I have not forgotten my drum but I will only play it to the tune of "Tetleys - did la did la dee..."!!