BEWARE: Lenovo Thinkpad L15 Gen3 SSD is practically un-upgradeable. Laptop comes with 256GB and bigger SSD is too thick to fit. There also goes a cooling plate on top. : r/thinkpad
Linux on an Lenovo Thinkpad X301
Amazon.com: FLEANE 512GB MS02 MicroSata uSATA 1.8inch SSD Compatible with DELL XT1 XT2 IBM X300 X301 T400S T410S Replace MK1229GSG MK1629GSG MK2529GSG 1.8" HDD (512GB) : Electronics
X301, The Ultimate Rebuild
1.8" Micro Sata Ssd 128gb For Lenovo Ibm X300 X301 T400s T410s Disk Drive Hdd - Solid State Drives - AliExpress
TDK 1.8' Micro-SATA 64GB SLC SSD for ThinkPad X300 X301 - China Slc Ssd and Solid-State Drive price | Made-in-China.com
ThinkPad X301 mSATA adapter caddy : r/thinkpad
How to upgrade LENOVO ThinkPad X130E SSD from HDD - YouTube