By now, you've heard about the eco-pitfalls of plastic bags. But what if you just forget a reusable one, despite your best intentions? Enter the collapsing bag. These lightweight totes shrink down for easy storage, so you can tuck them everywhere -- and never be without. Among our favorites: ChicoBags, Baggu, and Envirosax. Even more sustainable, the CarryEco from TokyoBay and Trek Light tote make use of recycled plastic and leftover hammock materials, respectively.
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