这个头盔又轻又容易携带
就是看起来不经砸，至少能减轻坠落时头撞墙的伤害。http://www.fastcompany.com/blog/cliff-kuang/design-innovation/almost-genius-cheap-flat-pack-recyclable-bike-helmet
http://images.fastcompany.com/upload/tatoo02.jpg
http://images.fastcompany.com/upload/tatoo05.jpg
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