Roll or fold in handbag?

With the appearance of low cost airlines nowadays many travelers decide for the easy way of traveling taking only one handbag. To pack a bag for 7 - 10 days is not an easy task, because usually only one hand luggage of limited amount is allowed. There are many different thoughts about what to take and how to organize these items, for example here or here. However there are different ways of thinking about if the clothes should be folded or rolled see for example here. And this is where The Daily Theory comes in. So roll or fold?