Most of the thin 24 game cases with the silicone lining can fit in the zipper portion of those style cases. There's a dozen or more brands, with different shells.

https://www.amazon.com/dp/B0BXNWKHSZ

https://www.amazon.com/Carrying-Nintendo-Protective-Cartridges-Portable-Protection/dp/B09VBDMN9X

Also might work for you. I've never used either, but I have heard good things about the Tomtoc brand.

Also found this one: https://www.amazon.com/Nintendo-Switch-Carrying-Case-Protective-Ballistic/dp/B01MY9JB2U