Pelican case that I bought 10+ years ago, designed to securely store microSD cards - those inserts removed - fits Coldcard Mk4 perfectly.
Slim, tapered ends, easily fits in pocket. Lanyard loop.
💧 Floats with Coldcard inside! 💧
Anyone have more alternate storage ideas that also fit accessories? https://pbs.twimg.com/media/FxqZiakaQAEwbd1?format=jpg&name=large
Nice!
Don't know if you want to keep the SD card together with the Coldcard