Fleischmann's® Original ActiveDry Yeast. Equals 16 envelopes. What is active dry yeast This is the original dry yeast designed to be dissolved in water (see above) prior to use. 2-1/4 tsp. Active dry yeast (1/4 oz) = 1 Env. Active dry yeast (1/4 oz) = 1 cake fresh yeast (0.6 oz). A gluten-free product. Consumer affairs: 1-800-777-4959. For recipe ideas and tips, visit: www.breadworld.com.