Black messenger bag, roughly 14 inches/60 cm across. The main body of the bag zips up and is covered by a flap that fastens with the plastic buckles shown in the picture. There are a couple of Velcro-fastened pockets at the front too.
It would hold a smallish-to-medium laptop but wasn't designed specifically as a laptop bag so doesn't have padding or anything.
Used but working condition. I've had it for many years so it's definitely not new! Collect from Llanishen.