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 purple.
From SmartTeck
Rivacase 8335 notebook case 39.6 cm (15.6") Briefcase Purple -
ShopBetter24
Laptop Case Rivacase Biscayne 15,6"
Shopaide
Laptop Case Rivacase Biscayne 15,6"