I found an inexpensive way to store both my Ledger and/or Trezor safely and securely.  In addition, I was also able to fit my Shift card.

It’s called a Koala Lifestyle Witz Waterproof Floating Sports Case.  It comes with a keychain and lanyard.  They come in various colors, including opaque and transparent versions.

Price: $15.95 (2-pack)

Link: https://amzn.to/2NcK3If