This is a Gregory single pocket with a silver tag. It can be attached to the "figure eight" parts, which are the four attachment points on the front panel of packs like the Day and a Half, to expand the capacity as an external pocket. It was only temporarily attached after purchase and has been stored at home, never used outdoors. Color: Black, Capacity: 3 liters Size: 32cm (height), 13.7cm (width), 5cm (depth) I am selling it to declutter. Please understand that this is a used item before purchasing.