Prompt: A certificate depicting a stylish and functional backpack against the background of a city or nature to demonstrate its versatility and convenience in everyday life. The brand name of the backpack and the amount of the certificate should also be clearly highlighted on the design. The text on the certificate, adapted to the Japanese language, should be concise and easy to understand. The certificate may also include a QR code for quick and convenient purchase processing via a mobile device. The visual style should be balanced, using bright, attractive colors to attract attention and create a positive impression.