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The paper bag causes some problems while bringing us convenience. For instance, a bag breaks once the weight of the stuff contained within it is beyond what the bag can bear. The two ends of the bag strap adopt a special red material which can stretch out and draw back, while the rest part is colored green which appears to be the extension of the tree root on the bag. Once the weight of goods goes beyond the limit of the bag, the red part emerges. As red means fire, it looks like as if the tree were broken by the fire. Thus, it gives a hint that we should put less stuff into it, make the best use of the tree and protect the environment.