This 6TB beast of an external hard drive is compatible with PC, Xbox One and PlayStation 4, and is down to only £97 on Amazon - the cheapest you'll find online and a not-too-shabby 25 per cent off the usual price.
The model is particularly popular on Amazon, and has excellent reviews on both the consumer and technical side. With capacity for around 100 games, you'll never need to delete a title again!
Not only super portable (it's about the same height as a pencil), it's also plug-and-play for minimal faff. In addition, it comes with a two-year warranty and is silent, not unlike the night.
Don't forget to honour your drive with a catchy name. Leomund's Secret Chest, Vlad Von Bytey and Not Porn are all viable options.