"I can never decide whether I prefer the look of a liquid liner or a more smudgy pencil, but I don't need to decide with the Revolution Eye Liner Awesome Felt & Kohl (£3.50), which has a felt-tip-style liquid liner on one end and a retractable kohl pencil on the other. This is one of the first things to go in my makeup bag if I'm travelling, as it's space-saving and offers more options depending on my whims! And that leaves me with £1 left to buy a bottle of diet coke at the till."