Xiaomi announced the Mi Business Casual Backpack last year. The backpack was only available in black, but Xiaomi has released two more colors, blue.
The second color is gray. The new colors are slightly more expensive at $16 than the black version, which retails for $13.
The backpack is made of durable polyester and has a waterproof coating. It also has a secret pocket and overlays with additional padded straps. The laptop compartment is sealed. When you travel, you have a trolley harness so you can take your suitcase and backpack together. You also have open side pockets that can hold a water bottle or umbrella.
You can purchase the Mi Business Casual Backpack on Mi.com now. The backpack already has many excellent reviews, and for $16 or $13, this is a recommended purchase.