A tablespoon is a non-scientific but very widely used unit of volume, which works very well in cooking, herbal medicine, etc. It is represented by a capacity of one tablespoon which varies from roughly 15 mL in the US to 20 mL in Australia.
1 If tea is properly stored, it can potentially last up to a year for green and black teas. White tea lasts about six months before it isn't as good in quality as when fresher. Stale tea (or bad tea) will taste flat, as if you're drinking paper.  Glass or ceramic containers are fine provided that they're opaque.
Best Answer: Tea bags don't go 'bad' in the way that fresh foods can get bacteria and actually make you sick when they go bad. Tea bags just lose their freshness and quality with time and exposure to light. Generally tea in bags will be at their best within 6 months after you purchased them. To keep them as fresh for as long as possible, keep them in an airtight container out of direct light. I highly recommend that if you really love tea that you try loose leaf tea - the flavour and quality is so much better. Enjoy!