This is a Gregory Shelter Light messenger bag from around the year 2000. Made in the USA. The Shelter Light material makes it completely waterproof. I'm not sure of the exact model name, but it seems there were a few sizes, and this is likely the large size. Approximate dimensions are: height 30cm, top width 50cm, depth 23cm. It has enough capacity to fit a shoebox. I don't think you'll find this on Mercari, and Gregory USA messenger bags are quite rare. There's some scuffing on the corners of the bottom and some overall soiling, but it's still in good condition and ready for use. Of course, the strap length is adjustable, and the strap itself is sturdy and strong. I'm not particularly eager to sell this at a discounted price.