If you carry around sensitive data or just don’t like how easy it is for just about anyone to access the data on your USB flash drive you may want to have a read about the Toshiba Encrypted USB Flash Drive.
The Toshiba Encrypted USB Flash Drive (B00NMVER4O) has made all of the encryption goodness happen on the hardware side. In other words, it works with any computer without using additional software or drivers. The encryption is unlocked via a PIN access code via the onboard keyboard. The hardware encryption is military grade AES 256-bit. To lock the device simply unplug it from your computer. Available in 4GB, 8GB, 16GB, and 32GB here.