make an add for A futuristic eco-friendly backpack designed to harvest rainwater, sleek and minimalist design, matte recycled fabric exterior with subtle integrated micro-gutters guiding rainwater into hidden channels, transparent vertical water reservoir strip on the side showing collected rainwater level, small solar panel embedded on top flap, soft blue LED water purity indicator, modern urban commuter wearing it in light rainfall, cinematic lighting, shallow depth of field, highly detailed, photorealistic, sustainable product design, 8k resolution, studio-quality realism Mehr sehen