The portable immersive XR training system, VirCube FLEXI acquires the traits and characteristics of VirCube, yet in a size of a hand-carry baggage, allowing to be easily transported to various spaces in small-scaled elderly homes or rehabilitation facilities to carry out VR rehabilitation training anytime, anywhere. Compatible with adjustable projection angles and naked-eye viewing mode, FLEXI is designed to suit all kinds of users from elderlies, physically disabled to bedridden patients, to fully immerse in and interact with virtual environment according to their abilities and without the need of wearing head-mounted device or glasses. Furthermore, due to its easy set-up feature with only one on/off button, even non-technical users could enjoy 270° immersive VR training in the blink of any eye. Equivalent to VirCube XR SPACE, FLEXI supports user performance database management for therapists’ reference and further planning. It is also equipped with localised VR rehabilitation-related content library for unlimited access. Applications include but are not limited to physical exercise, cognitive training, community living skills training, instrumental activities of daily living (IADLs), behavior management, art development and emotional relaxation.