Walk First, Then Snack, Matty Benedetto’s Step-Counting Lockbox Makes You Earn Every Bite

Matty Benedetto keeps finding new ways to turn everyday habits into elaborate projects. This time the Vermont designer behind Unnecessary Inventions has built a portable snack safe that stays shut until its owner logs a set number of steps. The idea is simple enough. Load a treat, dial in the calorie count, close the lid, and start walking. Only after the counter hits zero does the door release.

The case resembles a sturdy lunchbox, with a convenient handle on top. Everything was 3D printed, then finished with snappy UV-printed typography and laser-cut acrylic panels for a sleek appearance. There’s a window in the back that lets you see what’s inside at all times, and it’s actually very effective at keeping you going. Watching a bag of gummy bears shrink in size is an excellent way to stay motivated.

The front panel features a set of seven-segment displays that show your remaining step count in large, colorful numbers, as well as two rotary dials. They function as both a lock button and a mechanism to enter the calorie count of whatever snack you’re attempting to ‘accidentally’ conceal from yourself. Press the middle of the dial to close the box, then rotate it to enter the calorie count. The onboard computer calculates the number of steps required to burn all of those calories. I once saw a bag of gummy bears that required a series of procedures to release.

The electromagnets do all of the actual locking. They are quite strong, as a pair of them securely closes the door against any negligent tugging. An accelerometer on the inside monitors every step you take. As long as you keep moving, the counter will count down in real time. Stopping for a second freezes the counter until you move again. When the display reaches zero, the magnets disengage and the door snaps open.

All of the box’s brains are contained on an ESP32 development board, ensuring that all of the displays and devices work together seamlessly, while the cables and power are squeezed within so that nothing sticks out or gets in the way while walking. It’s light enough to take for a neighborhood loop or a longer errand run without feeling like a chore.

Benedetto tested it with gummy bears and a high step objective that corresponded to their calorie intake. The prize remained visible via the back glass at all times. He eventually burned off the calories, the magnets let go, and the bag became available. The entire process transforms getting a snack on a whim into a mini-commitment.
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