Can be unsafe in busy places or foreign countries- need an subtle alarm each time your bag has been unzipped.. vibration in the straps etc. Could include a mini camera in the back to take a snap-shot of the villain..
Backpack could also work to promote good posture. When your back is not pushed up against the correct sections of the back pack, the pack could heat up in sections to remind you to stand/walk with correct posture..
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