Mine is this - an aluminium case for an NVMe 2230 SSD with USB 3.2 Gen 2 support, i.e. 10Gbps, plus a WD 2TB 2230 NVMe SSD capable of far more than 10Gbps. All available over on AliExpress. Total damage = £148 or roughly the same in USD without the UK 20% sales tax. Use-case? It has to be video primarily but having 2TB of storage on an iPhone is a game-changer. You can keep your entire life on a dongle that weighs 1oz.