It's about one-one-hundred-fifty-thousandth as heavy as The CN Tower
In other words, 680 kilograms is 0.00000576710 times the weight of The CN Tower, and the weight of The CN Tower is 173,400 times that amount.(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada)
The CN Tower weighs approximately 117,910,000 kilograms. The Tower is home to the world's highest glass floor — a viewing area that allows visitors to look straight down 342 m (1,120 ft) to the ground below.
It's about 250,000 times as heavy as a Penny
In other words, the weight of a Penny is 0.00000370 times 680 kilograms.(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 0.0025 kilograms. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.
It's about one-three-hundred-thousandth as heavy as The Sears Tower
In other words, 680 kilograms is 0.000003370 times the weight of The Sears Tower, and the weight of The Sears Tower is 296,700 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 201,800,000 kilograms. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about 400,000 times as heavy as a Playing Card
In other words, 680 kilograms is 380,000 times the weight of a Playing Card, and the weight of a Playing Card is 0.00000260 times that amount.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 0.0018 kilograms. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.
It's about one-five-hundred-thousandth as heavy as The Empire State Building
In other words, 680 kilograms is 0.000002050 times the weight of The Empire State Building, and the weight of The Empire State Building is 488,000 times that amount.(New York City, New York)
The Empire State Building weighs approximately 331,000,000 kilograms. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about 500,000 times as heavy as a Paper Clip
In other words, the weight of a Paper Clip is 0.00000200 times 680 kilograms.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 0.0014 kilograms. The country of Norway has used the paper clip as something of a national symbol since the end of World War II based on the erroneous notion that the paperclip was invented by a Norwegian, Johan Vaaler. However, the paperclip had already been in existence for at least 30 years by the time of Vaaler patented his paperclip design.
It's about 600,000 times as heavy as a Jelly Bean
In other words, 680 kilograms is 620,000 times the weight of a Jelly Bean, and the weight of a Jelly Bean is 0.00000160 times that amount.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 0.0011 kilograms. President Ronald Reagan cited jelly beans as his favorite candy and 3,200 kilograms of the candies were served at his first inauguration in 1981.