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.
Mulberry Leaf Tea is quite simply one of the best things you can consume for your health. Few other Teas can offer such a wide range of health benefits. In East Asia Mulberry Leaf Tea is known as a possible aid to decreasing Cholesterol, Hypertension and the control of blood sugar levels.