Kingwin M.2 SSD NVMe External Enclosure, 10Gbps USB 3.1 Gen 2 M-Key to USB C Solid State Drive Adapter, PCIe USB 3.0 USB C Cables, Fit Size 2230/2242/2260/2280, Aluminum, KM-U3NGFF-NVE : Electronics
Steam Deck has M.2 2230 SSD slot, but Valve does not recommend upgrading it - VideoCardz.com