MAKE Magazine’s youtube channel shared a great little Sunday project to make your travels a little more secure. It is a personal alarm system/siren for your backpack.
MAKE Weekend Project: Shrieking Anti-Theft Backpack: https://youtu.be/Btil-qWKeEQ
It would be a great first project to build skills in the area of hobby electronics. OR maybe ask around your friends if you are not the mad scientist type. Always use tools and equipment safely and at your own risk.
Instructables also have a selection of bag security project how to’s.
Amazon seem to have the market cornered for cheap ready-to-go bag security devices/alarms if that is your thing. Ebay may also be a good source to find something with low shipping cost close to home.
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Travel light, travel often.