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I got one from Amazon. It's adequate for what I need - I throw it in a bike bag and cram in my lunch, camera, phone, maybe some clothes and sometimes other stuff, then ride 11 miles to work and 11 back, every day. It's enough protection. To get an idea of what it is, think oversized Altoids tin with some thin padding. I probably could have found something cheaper but my time is worth something.
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