Yes, powerful modern phone LED flashlights can damage plastic bags or fabric if left on while pressed closely against them for a long time. High-output LEDs create heat, and when that heat is trapped—such as inside a pocket or under a bag—it can build up faster than it escapes. Thin plastics can soften, shrink, or melt, and fabrics like denim can scorch or weaken, especially if airflow is blocked. While this rarely causes open flames, it can still ruin clothing, damage the phone, or create a fire risk in extreme cases. Avoid leaving your flashlight on in pockets, bags, or tight spaces, and turn it off when not needed.
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