Can I combine my Knix and Knixteen carts while shopping? Isabella October 11, 2019 16:03 Updated Follow Knix and Knixteen orders are picked, packed and shipped out separately, so we're unable to combine orders at this time! Related articles Where are your retail locations? What's my Knix Size? Where in the world does Knix ship to (and how much does it cost)? What happened to your iconic Athletic undies? What's my order status?