Here's a brilliantly simple idea: the Gravity Ruler is a very simple way to weigh your luggage before heading off on a trip. With airlines getting more and more strict about what you can carry on and check, it's important to know where you stand before heading to the airport.

The Gravity Ruler is simply a bungee cord that you loop through your luggage handle. As you lift it up, an orange band on the cord moves through a clear sheath to show you just how much it weighs. Perfect!

Via Core77