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@dicki
when i was travelling i heard about these movement detectors / sensors that you slot into your rucksack they have a 30 sec timer once armed it acts like a car alarm any bump movement w2ill trigger the alarm to go off. if you put it under your seat or somewhere not to obvious you will hear the alarm if someone tries to move it not so useful when deep in the bowels of a pub but will give any bike theif a good heart attack