PortableSolid.app is an application that functions as a camouflage folder that is locked by your password. Double-click the PortableSolid.app icon then you can open an invisible camouflage folder that is locked by your password. Drop files or folders on to the PortableSolid.app icon then files or folders move to an invisible camouflage folder (named ".SolidFolder").
Place PortableSolid.app on your Dock and use it conveniently. PortableSolid.app is portable and movable because it has a invisible camouflage folder in its own package. You can use it on a volume such as USB memory stick, the MO media, and an external hard disk if it is possible to read/write. Does not work with a CD-ROM, CD-RW, DVD being only for reading.