The Nau Envelope Courier Pack ($240) is ideal for bike-riding individuals - and also for those who aren’t.  You can secure the bag on your bike rack for a smoother ride via the bag’s hooks. For non-bikers, commuting is made more comfortable with the Envelope Courier Pack as it also designed to strap perfectly to your back. The roll-top bag is made from wool felt and recycled polyester, making it perfect for carrying your laptop and other belongings.