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Create a commercial-quality educational product campaign in a vertical 2:3 Pinterest composition. Show a foldable backpack rain cover through three connected stages: compact silhouette, fitted backpack contour, and beaded water rolling off fabric in a controlled rain test. Use chartreuse, ink navy, blush, and satin silver, bold directional lighting, crisp close-up details, simple geometric dividers, no real brands, no trademarked characters, no watermark, and no unintended readable text.