This is a Thermos lunch jar. While the exact model number isn't available now, it seems to be similar to the JBG-1801. I bought it, but it hasn't been used for packed lunches in my home. I used it at home 2-3 times and then stored it at home for a long time. There is no box or instruction manual. It's clean with little use, but it's not unused, so please understand that. Thank you! ^ ^