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The Ledger Nano is a smartcard based Bitcoin hardware wallet. It stores Bitcoin private keys and signs transactions in its secure environment. It is not a traditional USB stick, but rather requires a software wallet to provide an interface to interact with the wallet’s keys.
The Ledger HW.1 is a dimmed down version of the Ledger Nano. It costs about $17.
The OpenDime is a new Bitcoin hardware device that was released in April 2016. It calls itself the “First Bitcoin Bearer Bond”.
Encrypted USB Stick
One creative option is to create a Bitcoin paper wallet. Instead of printing the paper wallet’s private keys, they can be saved on an encrypted USB stick.