DIY'ers, modelmakers, woodworkers et cetera all come up with solutions to store differently-sized screws, bolts, and small parts. Some of us use egg crates or Dixie cups, others go with those little plastic crafts boxes filled with a grid of uniformly-sized compartments.
But uniformly-sized boxes don't always cut it, like if you need to store tiny machine screws and 3" carriage bolts in the same kit. That's why I love the idea of Adafruit's new Modular Snap Boxes, which let you buy the sizes you need, then snap them together Voltron-style to make your own storage kit. And at US $2.50 for a large box and $5.95 for a ten-pack of tiny-storage boxes, with other prices and sizes in between, it won't break the small-storage bank.