IronKey Defender F150 64GB USB Flash Drive
While the Imation IronKey Enterprise S1000 is an amazingly secure flash drive, it is also incredibly expensive. This is a great option that gives you all of the impressive security found elsewhere, but at a much more reasonable price, as long as you can accept a few limitations. In terms of security, this is still an amazing option thanks to FIPS 140-2 Level 3 validation and AES 256-bit encryption that gives you military-grade data security right in the palm of your hand.
One thing to keep in mind is this is a USB 2.0 model, so while it works well and keeps your data secure, transfer rates will be lower than with a USB 3.0 drive. However, this is still a great option if your computer only has USB 2.0 ports. There are only four storage sizes available with this one including 8GB, 16GB, 32GB, and 64GB which still gives you lots of storage options but it can be an issue if you need more flexibility or want to hold a lot more data.