You've been there. You buy a sleek-looking vaporizer, slip it into your jeans, and by lunchtime you're adjusting it every few steps. Either it's too long, too heavy, or the shape digs into your thigh. The size-to-pocketability ratio is the difference between a device you actually use and one that lives in a drawer.

Today I'm not going to throw specs at you and pretend they translate to real life. Instead, let's talk about what 'pocketable' really means, and how to judge it before you hand over your money.