Boxmeup is a new web app and companion Android app that lets you pack a box, or container with items, enter the contents of that container into the web app, and then print a QR code for it that can be used with your phone to pull up a list of its contents at any time.
Boxmeup lets you add the contents of your boxes or storage containers on your desktop, where it's easier to type, and then the app gives you QR codes to print and use to label your boxes. Scan the QR codes with the Android app, and you'll instantly be able to see what's inside.
This way you'll never have to stand in front of a pile of boxes after moving into a new place, wonder what's inside the one at the bottom, and have to move all of the ones on top to find out. There's no reason you couldn't use the app for entire storage units as well, with a QR code on the door or just inside that will tell you all of the contents of the space.