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.
A storage canister can slow oxidation and allow tea bags a longer shelf life. To keep moisture, oxygen and rival smells away from your tea bags, place them in an airtight, preferably metal, container and away from sunlight, heat and high humidity. This may keep the tea fresh for up to two years. An exception to this guideline pertains to the aged Keemun and Pu-erh teas, which like wine require oxygen â but not heat and moisture â to continue to mature. A fermented tea made from a leaf grown in Yunnan in China, pur-erh tea can stay fresh for up to 50 years. Tea purveyors came up with the six-month guideline for best results, but if you arenât picky and donât want to waste tea bags, you may be able to store them for up to two years.