Usb Stick for security (bank account)

Hello I keep my bank account numbers and passwords in a kwallet file. I would like to buy some external usb flash disk as a backup to keep the file inside. Could you please tell me if there is an encrypted way in linux to store the data inthere?

For example:
Buy a stick that encrypts the data
Encrypt the data by using some filesystem. Does this work on every usb stick?
Anything else that came on your mind

REgards
Alex

In general I would say an USB stick is not different from any disk (for the system that is). You can partition it as a disk (when needed) and put file systems on it like on a disk (partition). Thus also encrypted filesystems of any type that are available for the revolving type of mass storage (disk).