The properties of this light function have been determined. My caveat in giving it a fifth star is due to the strap. I live in a colder climate and walk outside year round. In winter I wear a thick jacket. The straps could have been expanded in my opinion to allow for a more comfortable fit when carrying more clothing. It looks like it's intended for people who wear warmer clothes. I'm tall and not too tall, but when I dress in layers, the girth of both straps is at the limit. a cut according to seasonal clothing would be a great idea for five starts!
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