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
ÜZBL Rugged Hard Shell Case for Lenovo ThinkPad L15 G3
Lenovo ThinkPad L15 Gen 3 (Intel) i7-1255U Computer portatile 39,6 cm (15.6) Full HD Intel® Core™ i7 16 GB DDR4-SDRAM 512 GB SSD Wi-Fi 6 (802.11ax) Windows 11 Pro Nero