Why else would you do that, the only reason I recall doing it for was to fall or run into something and hurl. Of course, falling or running into something was an accident.
It is likely tea, but a quick search found several brands of instant coffee bags that look and are used exactly like tea, so it might be coffee look up Folgers Coffee Singles Classic Roast Coffee Bags.
It is likely a tea bag but if you look on Amazon you can get instant coffee bags, so there is a chance that it actually is coffee. I had to do a search just to find out if they existed.
Why else would you do that, the only reason I recall doing it for was to fall or run into something and hurl. Of course, falling or running into something was an accident.