Use a bag such as this one to make your commute to work a bit easier. Maybe not a good choice if you prefer lots of colour choices, but it does come in black.
From OnBuy
Kensington Contour Carrying Case Backpack for 43.2 Cm 17" Notebook Shoulder K60381EU
Quzo
Kensington Contour 2.0 17" Pro Laptop Backpack
This product is also available at 3 unverified stores.