Getting across a big airport can be a real pain, especially if you're running late for a flight. But if you have this backpack with a built in scooter, you can zip past all of the other suckers jogging to the gate.

Right now, our luggage does little more than store stuff. Fair enough, right? But maybe we figure out a way to store stuff better, and just maybe we could even make our luggage do a little more. Mexico's Alberto Villareal certainly thinks so, and he's taken a stab at rethinking three pieces of luggage.

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...