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The bag strap adopts a red flexible material. We use the transparent plastic and mark graduation on it where the strap is fixed. Once the stuff is put into the bag, the two ends of the bag strap stretch owing to the gravity and then the red part emerges. The weight of the stuff contained within the bag can be judged by the length of the exposed part. Once the red part reaches the top, it indicates the limit of the weight. In this way, we can not only know the weight of the stuff but also be reminded not to carry too heavy stuff. Any waste of materials is prevented.