I use one of these in black. Not the biggest, but has a compartments for laptop, pens, etc and stays put on your shoulder. Not 100% waterproof either, but it takes a while to get through.
@Sumo started
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I use one of these in black. Not the biggest, but has a compartments for laptop, pens, etc and stays put on your shoulder. Not 100% waterproof either, but it takes a while to get through.