This is the FLOORPACK Flex, created by YouTuber Keisuke Takahashi. It's very convenient as a camera bag and is also a highly-rated backpack for everyday use, but I need to sell it due to unexpected expenses. I purchased it from the official website for 28,000 yen. It has only been used a few times, so it's in very good condition. I will ship it promptly, so please consider purchasing it.