Vinted is ok as long as nothing goes wrong. The seller bears all the risk of an item arriving smashed because the courier dropped it. As a seller you don't chose the courier and you can't buy insurance (unlike the buyer who must buy insurance) so if an item is damaged in transit, Vinted argues that you didn't pack it correctly - even if you did. No matter how well you wrapped it, if it breaks, you end up with nothing. So DON'T SELL ANYTHING THAT COULD GET DAMAGED IN TRANSIT.