Ever needed to put your stuff in a storage unit? Recent research predicts the global self-storage market will be worth around $70bn by 2031 and the UK’s self-storage industry made more than £1bn last year for the first time ever.But what’s behind this rapid growth? What are people putting into these units? And what does it have to do with Gen Z and internet shoppers?We also hear from critics on what the growing industry says about housing around the world. Presented and produced by Sam Gruet(Image: A young woman loads storage boxes into a unit. Credit: Getty Images)