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K9 Sport Sack

K9 Sport Sack Air Plus Dog Carrier Backpack - Mint


HUMPHREY SAYS: Your dog can experience more adventures with you in the safety and comfort of this backpack. Bring your dog to your crazy hikes, bike rides and more! The Air Plus model features a detachable storage bag which is a huge plus if you have more stuff to carry - it's like having your own backpack and a dog carrier, in one! Also available in Black and Light Grey.

PLEASE NOTE: K9 Sport Sack items are shipped directly from the brand, therefore can only be exchanged, and are non-refundable. K9 Sport Sack items cannot be shipped outside the United States.

Unlock a 20% coupon code towards a custom embroidered patch (name, Instagram handle, etc.) with any purchase of a K9 Sport Sack Air and Air Plus! Simply e-mail us for your discount code.


  • This model is the brand's upgraded version from its original "Air" model based on years of research and feedback from customers, and features additional storage, padding and ventilation
  • Perfect for intermediate hikes, bike rides and any moderate outing you can dream up
  • Like all K9 Sport Sack models, this carrier backpack was designed under the close direction of veterinarians, dog trainers and outdoor product engineers to be ergonomic, safe and strong
  • 40 lb / 18 kg weight limit
  • K9 Sport Sack AIR Features:
    • Detachable storage bag (14" x 9"). Don't forget your gear!
    • Fully ventilated sides for maximum refreshing air flow
    • Padded back panel for increased comfort and cooling
    • Thicker, wider, pressure relieving shoulder straps for increased comfort
    • Mesh dual side pockets for increased ventilation
    • Ventilated cooling side panels
    • Over 5 different safety/fail-safe features
    • Adjustable dual side pockets
    • Sternum strap avalanche whistle clip


  • Please refer to sizing guide image
  • In between sizes? If you are wider and shorter, size up and get a booster block.
    • For example, Humphrey (18 lb, small French bulldog) can fit a size Small for length AND a size Medium in terms of width and weight. In this case, we prefer to size up to a Medium which is wider, and add the booster block for optimal comfort
  • Small: 14" - 17" from collar to rear in "begging position"

  • Medium: 17" - 20" from collar to rear in "begging position"

  • Large: 20" - 23" from collar to rear in "begging position"

Tutorial: How to Measure Your Dog for the K9 Sport Sack

    Tutorial: How to Get Your Dog into the K9 Sport Sack