I bought that one too but for the 12.9. My hope is I can fit the iPad, ASK, and pencil all together without separating, I’ll let you know on Friday when it arrives.
Inateck 13-13.3" MacBook Air/ Retina Macbook Pro/Surface Laptop 2017/12.9" iPad Pro Sleeve Case Cover Ultrabook Netbook Carrying Case Protector Bag, Dark Gray (MP1300-DG)
https://www.amazon.com/dp/B01D0VM2L0/ref=cm_sw_r_cp_tai_zgr7BbZ2NWVFA
Inateck 13-13.3" MacBook Air/ Retina Macbook Pro/Surface Laptop 2017/12.9" iPad Pro Sleeve Case Cover Ultrabook Netbook Carrying Case Protector Bag, Dark Gray (MP1300-DG)
https://www.amazon.com/dp/B01D0VM2L0/ref=cm_sw_r_cp_tai_zgr7BbZ2NWVFA
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