It's a cute concert/event bag meant for it. It's sold by the "football" as in soccer, area of the store. Yes it is a legit size for BtS. It's not too small nor is it too large. It has an adjustable cross body strap and 2 small grab handles. It also has a small outside pocket slot for maybe a picture card for your favorite BTS singer or who ever. I tried putting in my cell phone, in the outside pocket slot, but it's too small. The bag is round and it fits a rolled up thin sweater or a long sleeve shirt, plus fits in phone, keys, wallet and a lipstick. It's kinda like a size of a coach terri purse, but just about 5 inches bigger, plus this bag is round so that's a plus. It has a zipper top, so nothing would fall out. The only thing is the strap is a thick fabric, wish it was made like lululemon strap. Satin smooth kind of a fabric strap.

Be sure to read the size/fit product description. This bag is more like a small purse. If you are thinking of purchasing this as a kit bag, I would look for something bigger. The price is too much for what it is.