Finding the Flavor of Chocolate. Gregory Ziegler puts a small block of chocolate into a styrofoam bowl and sticks it into the microwave. Soon, a lovely sweet aroma spreads through the air, lending warmth to the otherwise bleak lab. Ziegler takes the bowl out of the microwave; it's filled with a thick, swirling liquid.
First Class Large Envelope/Flat Mail. Minimum size: 6 1/8 inches tall or 11 1/2 inches long and 0.007 inches thick. Maximum size: 12 inches tall x 15 inches long and 3/4 inches thick. Maximum weight: Up to 13 oz.
The minimum dimensions for a parcel would be one that exceeds the maximum dimension for a Letter or a Flat. Maximum size for Letters are 6 1/8x11 1/2x1/4. Maximum size for Flats/Large Envelope are 12x15x3/4. Flats must also be flexible and uniform in thickness.