Weight Comparisons August 10, 2020 Amanda Bales General Information, How To... 0 A regular, #10 envelope with less than 12 sheets of printer paper in it will be around 1 ounce A larger envelope with between 12 – 25 sheets of regular paper in it will be around 2 ounces A smartphone with a case is about 8 ounces An empty, 8oz ceramic coffee mug weighs around 12 ounces A Swingline brand stapler is about 16oz, or 1lb