An old phone case is a great no-spend option ... A "tough case," which is designed to be extra durable, would be great. Conversely, flip cases and leather cases aren't ideal for this.

We've all been there. You head out for a pint with your mates, and before the first round's even poured, everyone's heads are down – thumbs scrolling, eyes glazed. Enter: The Flipper. Well now, ...