Amazon.com: Gelrova LED Backpack 17 Inch, City Serise Full 。GELROVA LED Backpack City Series 17\" Condition: New / Unused DIY With App - Custom LED Backpack - Effortlessly customize any display content you want using the LOYSPACE and LOY PLAY apps. Extra-Large LED Screen Backpack - The 9.5 by 9.5-inch screen provides a clear display for most images and rich text. Spacious Capacity - Dual-layer design with multiple compartments to store everything you need — fits up to a 15.6-inch laptop, water bottles, documents, gadgets, and essentials. Exceptional Attention to Detail: High-Quality Waterproof Zipper Breathable Air Cushion Padding Secure Luggage Strap Hidden Back Pocket with Zipper