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