If volume - 1 US teaspoon = 0.17 ounces US<br />If weight - it depends of the density of your foodstuff. For example<br />1 US teaspoon of water = 0.17 oz<br />1 US teaspoon of buckwheat = 0.15 oz<br />1 US teaspoon of honey = 0.23 oz and so on.
Comparison of Letter (shaded light blue) and Government letter sizes with some similar paper and photographic paper sizes. Letter or US Letter is a paper size commonly used as home or office stationery in Canada, the United States, Mexico and the Dominican Republic. It measures 8.5 by 11.0 inches (215.9 by 279.4 mm). US Letter size paper is a standard defined by the American National Standards Institute (ANSI), in contrast to the A4 paper used by all other nations, which is defined by the International Organization for Standardization (specifically, in ISO 216).
To be eligible for mailing at the price for letters: Must be rectangular. A minimum of 3.5 inches in height by 5 inches in length and at least .007 inches thick. A maximum of 6.125 inches in height by 11.5 inches in length and .25 inches thick. Not more than 3.5 ounces (First-Class Mail letter-size pieces over 3.5 ounces pay flat-size prices.