This is a briefcase from LIHIT LAB. I think it can also be used as a bag-in-bag. - Brand: LIHIT LAB. - Model Name: SMART FIT - Color: Black ※ Shoulder strap is not included. I purchased this on this site, but I haven't had many opportunities to use it, so I am selling it. There are no noticeable stains or scratches, but it is a used item, so I will sell it to someone who understands this. Thank you.