Size doesn't matter. According to Forbes.com lists of the 20 most important tools of all time a simple Duct Tape figured high on the list.

Let me enlighten you on its history. This humble tool was invented in early 1940 by scientists at Permacell, a division of the Johnson & Johnson Co to be used at the battle field. It is called 'duck tape" because it repelles water.
Its not only about the quick and lasting fix. Take a look at what The Duct Tape Guys who has made millions from it says
It's so strong people have used it to pull cars out of ditches, yet you can rip it with your bare hands.
In February 2003, the U.S. Department of Homeland Security advised Americans to stock up duct tape in the event of a chemical or biological attack.
It even has medicinal uses. In 2002, doctors at the Madigan Army Medical Center in Tacoma, Washington, used it to cure warts.
So friends you must have those little handy tools everywhere you go .