I haven't used this in over five years; it's just been stored away. The outer material is cotton, and the inside is polyester. It has a large gusset, so I think it would be useful for picnics, to carry things like lunch boxes. The top length is about 37 cm, the bottom length is about 23 cm, and the height is about 22.5 cm. The gusset at the bottom is about 15 cm. Please refrain from purchasing if you are concerned about the color, as it has been stored at home.