A backpack such as this one can be very useful for a number of things. It only comes in one colour, black, but it does look quite neat.
From OnBuy
Lenovo GX40Q17225 15.6 in. Backpack B210 Black-ROW
Conrad Electronic
Lenovo Laptop backpack B210 Suitable for up to: 39,6 cm (15,6) Charcoal, Black