The tag has a range of 200 feet and the app will still remember its last location even when it's not in range. It comes in a bunch of colors so you can find a CalypsoTag that matches whatever rolling travel companion you've got.
Ethan Wolff-Mann is the Gear editor of Supercompressor. He prefers traveling Jack Reacher style, with nothing but the clothes on his back and a collapsible toothbrush. Follow him on Twitter @ewolffmann.