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. The certificate can also include elegant graphic elements in the style of \"stylish diffusion\", which will emphasize the fashionable and modern image of the brand. You can use light and shadow effects to add depth and volume to the image, which will make the design more attractive and attractive. You can also add small illustrations showing the various uses of the backpack (for example, travel, sports, casual wear) to demonstrate its versatility. Adapting the design to the \"stable diffusion\" style should reflect current trends and be attractive to a target audience that appreciates style and practicality.