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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: USPS Priority Mail shipping (average delivery in 2-5 days unless alternate method is selected). UPS 2nd Day Air shipping is also available.

    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 (Excludes klearance and custom items). Learn more about our policy here.

    Customer Reviews

    Based on 328 reviews
    Perfect for family outings with your fur babies

    Took our 10/11-lbs terrier mixes (Mac & Scout) to Sedona, Santa Fe, Manitou Springs and Glenwood Springs on a family getaway, and the Sports Sack Plus 2 (medium for both) were perfect. We put in hydration bladders in the attached storage packs, and they came in handy during those longer walks. The side pockets were great in holding collapsible bowls and leashes. The pups were comfortable and secured during our scramble up and down the hills.

    The name patches were also helpful, as we were bombarded with compliments and questions about the pups/packs (was helpful not having to tell folks our dogs’ names every 2 second on the hike). FYI @K9SS, we probably helped sell a dozen of the packs for you 😜.

    Lastly, we got the small pack for Scout (smaller of the 2 pups). Although she fit in the pack fine, the small pack was a bit small (across the chest) for us to carry (5-11 guys who are not skinny). Customer service was fantastic and exchanged our pack for a medium within the week (Thank You)!

    May I propose a new product? I know the Rover 2 has a waist belt, but it would be good to have smaller packs with waist belts too (for our longer treks that will help take the weight off our shoulders/torsos). Even with the booster blocks a 10-lbs dog will not fit in the larger packs. Thank you K9SS!!

    So far so good!

    Jasper is an almost 12 years old, 27# Corgi/Jack Russell mix who loves to go on walks & usually adventurously hikes ~7 miles across various terrain on the weekends. He's currently having some issues we're working on with his back legs so he can't go too far on cage rest, but this bag has been perfect and a walk saver for him while his sister still carries on around he neighborhood.
    He fits comfortably in the large Plus2. Might need a booster block to sit up a tiny bit higher - so far we've been using a rolled up blanket, but he sits up and looks around excitedly on walks.
    While in the bag, he sits perfectly on my back and the straps are comfortable. Almost wish there was another buckle strap around the waist, but everything still feels secure. We've been on 7 decent length walks in the past 2.5 weeks since we got the bag & no regrets so far

    Fantastic for our Toy Poodles

    We used the bags 3 times so far with Cooper (7,5lbs) and Whippet (5lbs). Size SMALL with boosters for both. Perfect for Cooper he'll stay in place, but Whippet gets his paws out too easily and is able to turn on the side a bit. Very nice to go for hikes with them being able to explore looking in front of them.

    The pockets for water bottles on the side are very small, too small for most reusable water bottles!

    Best idea ever

    Took me forever looking for this idea and I finally nailed it. This is exactly what I was looking for to take my dog on the bike and on my walks and small hikes as I'm trying to shed some lbs and with my 20 lb Jake behind me is extra exercise for me. He absolutely loves it being so near his mommy and I absolutely love the idea so its a win win. Thank you for this comfortable creation. It's brilliant. Easy to use, very strong material and my dog feels comfortable inside it. I highly recommend. He is a shitszu mixed and weighs 20 lbs and I got the small size.

    Great dog carrier

    This is a great backpack. It works exactly as advertised. My little Corgi wasn’t super happy about getting in it the first time however once I took him for a bike ride on my back he got it. Now he’s excited to go.