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K9 Sport Sack

K9 Sport Sack® PLUS 2


The Plus 2 is a backpack dog carrier with a multi-functional storage pack. The storage pack is great for bringing gear, treats, or other necessities along on your adventures. It also acts as a support for your dog’s back, pulling your pup in snuggly against your back. Available in sizes S-L, its thicker shoulder straps and padded back panel allow for more weight and strenuous activities. The Plus 2 is our most complete carrier for small to medium sized dogs and fits dog owners small to large in build.

40 lb (18 kg) weight limit 

  • Detachable storage bag (14"x9") 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
  • Mesh dual side pockets for increased ventilation
  • Ventilated cooling side panels
  • Adjustable dual side pockets
  • Sternum strap avalanche whistle clip
  • Newly added PLUS 2 features include:
  • Wide Base to accommodate your pet and its tail
  • Adjustable Side and Back Cinch Straps to ensure the best fit
  • Fur Flap (No more zipping your dog's hair in the bag)
  • Adjustable Collar Enclosure

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All K9 Sport Sack carriers are specially developed under the close direction of animal professionals, veterinarians, dog trainers, and outdoor product engineers to be ergonomic, safe, and strong.

    Shipping, Warranty & Returns


    Domestic orders: A variety of UPS shipping methods are available. Please allow for 1-2 days of packaging before your item ships, 2-5 days if ordering a waterproofed or custom item.

    International orders: UPS Worldwide Expedited shipping (average delivery in 3-5 days, but varies depending on location).

    For more information regarding shipping click here.


    We cover manufacturers defects and product malfunctions for the first 60 days (Excludes klearance and custom items). Learn more about our policy here.


    If you end up with incorrect sizing don't worry! All size exchanges within 60 days are free excluding original shipping costs (Also excludes klearance and custom items). Learn more about our policy here.

    Customer Reviews

    Based on 369 reviews
    Great Customer Service

    I purchased a Plus 2 and decided that I wanted the hip belt for my doggo who is close to the weight limit of the plus. At the time I made the return Knavigates were out of stock and so I returned for a gift card so that I could purchase a Knavigate once stock arrived. While checking for stock a few days later I noticed that the website would let me put a Knavigate in my cart, so I contacted customer service to see if I could change my return to an exchange, and they were great! They held the one Knavigate they had for me until my Plus arrived to them. Puppo will be excited to have his new bag once it arrives! He loves being held like a baby, it eases his anxiety. with the Sportsack, I will be able to hold him and keep my arms free!

    Courtney Sullivan
    Great pack for multiple uses

    Our 25 lb beagle Finn loves riding in the Sport Sack. Sometimes we pop him in on long hikes to give him a break or when we're scrambling over rocks (he can ride on our backs or we can pass the Sport Sack from person to person with Finn inside). He also sometimes gets totally overwhelmed by his prey drive and sniffs and barks himself into a frenzy so calming him down and popping him in the Sport Sack often helps him to reset so he can carry on with his sniffing adventure.

    Ma. Aleth C. Reblora
    Great Bag for Cycling with my Toy Poodle

    I bought an Air Plus 2. I had some issues in getting my toy poodle in at first and I thought the size is too small but turns out it was just right. Very comfortable to use while cycling on a road bike and I still can speed up even with my furbaby on my back.

    Elizabeth Caster
    Sturdy and comfortable

    We walk 4+ km daily with our Bichon Frise and Standard Poodle. After 4km, the Bichon's legs (much shorter than all the rest!) are ready for break, and the K9 Sport Sack has allowed us to keep walking while she rides in style. People laugh at first, but we tell them it's been 4 km, not just around the block and then they accept it for the great idea it is. Our Bichon willingly comes to be placed in the backpack and seems quite comfortable. One adjustment I made was to add an extra carabiner clip to the one at the collar as it was quite small and didn't allow the flexibility I needed when getting her zipped in. Looking for the perfect sized bottle to fit the side pockets, many I have are too large. A standard 500 ml water bottle fits perfect but crinkles when not full. I am very happy with the purchase and I expect with the really good quality that I will be using this for many years.

    Jared Camp

    Excellent backpack, my corgi loves going on bike rides with me im this.