Spare yourself the hassle of carrying the computer in your hand while commuting to work. It is made from several different materials, including neoprene.
From OnBuy
Dicota Skin BASE 12-12.5 31.8 cm (12.5") Sleeve case Grey
The product is available from £10.68 at international stores.
Technoworld PLC
Dicota Skin BASE 12-12.5 notebook case 31.8 cm (12.5") Sleeve case Grey