Whether you're in college or you just like working from coffee shops, leaving your backpack sitting around is a good way to get it stolen. If you don't want to dedicate 100 percent of your brain power to watching your bag, Instructables user bergerab shows you how to build a small anti-theft device for you bag to sound the alarms if someone tries to steal it.
via Lifehacker http://ift.tt/1tFsHmy
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