I believe the standard SI unit for this sort of thing is the Olympic swimming pool, but I think we can allow the use of football fields in a forum where many users are still familiar with the US customary system.
As a European I started reading football and assumed "soccer". I have no idea how big an Amaerica football field is in comparison.
100 yards long, not including endzones, and 53.33' yards wide. Convenient, eh?
The day will come, dear Americans, when you will have to finally get your measuring sh*t together! :)
Well, how many libraries of Congress can all these phones hold?
"The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole"
If we assume one iPhone to be 5 inches then we can span the equator to the North pole 12.7 times (5 inches is .127 meters).
The estimate of the distance from the equator to the North Pole was off by about 20%, though.