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K9 Sport Sack

K9 Sport Sack® Air 2


The Air 2 is the backpack dog carrier people know best. Available in sizes XS-L, it is a durable, breathable mid-level backpack perfect for smaller to medium size dogs. The Air 2 is offered at a reasonable price while including the essential safety and comfort features needed for a comfortable experience. This backpack is recommended for intermediate grade walks, hikes, public transportation, and bike rides. The Air 2 is constructed with durable Cordura® fabric and form-fitting mesh on the sides for breathability.

30 lb (13 kg) weight limit

  • Ventilated side panels for cooling
  • Adjustable dual side pockets
  • Sternum strap with avalanche whistle clip
  • Wide Base to accommodate your pet and its tail
  • Updated Side Mesh
  • New Side and Back Cinch Straps
  • Updated Shoulder Strap Design (No More Popping Off Chest Clips) 
  • 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 267 reviews
So great!

We have an elderly dog (cockatoo) who can’t walk for long periods of time, especially up hills. We got this for her and she LOVES going for walks in it. She almost falls asleep every time! She doesn’t get fidgety, and the design seems super comfortable to her. Definitely a great purchase! She and I both tend to get pretty warm between my back and her belly, so we do have to stop and take periodic breaks to cool off. I’m not sure that’s something you can prevent. Just going to happen like when wearing any book bag! Thanks K9 Sport Sack! We love our purchase!

Great product

Best way to take our little dog with us biking. Sturdy construction with attention to details and safety. For example, there is a wide flap of fabric to keep the dog's floof out of the zipper, or a safety catch to make sure the zipper doesn't come undone. Easy to put our dog into the bag, the dog is comfortable in it, and the backpack is comfortable for us to wear.

My Maltese loves it

It took a time or two for him to get used to it, But now my Maltese jumps with excitement when he sees his k9sportsack. He is 5lbs and I ordered an xsmall with a booster block just in case. We did not end up needing the booster block. It takes about 15
Min for my pup to “settle in”. He tends to want to stand at first. But once he settles he is content for 1.5 hours. It is so awesome to be able to take him on hikes and long walks. Highly recommend! Also love the tropical Pattern!

Exactly what we needed

This backpack is exactly what I needed for my little guy. He becomes ornery and refuses to walk at times, but I love taking him with me on long walks. This backpack is perfect for us and our adventures. He is very safe and secure in it, and he likes it very much. It's easy to install him in it as well.

At the end dog was happy to have the Sack

Getting in the Dachshund senior was not easy.I tried it with treats and as recommended. So I just put him into that Backsack and then on my back (pict 1) He was not super happy. But after a 8km hike my grandpa (10y old) was very satisfied and it was worth the money! ( pict 4) Actually I did not want to pay that much (total plus custom toll fee was 110€) but the bag is pretty cool,comfortable and also nice to use without the dog. All in all I recommend it! (My dog is ~11kg, I chose Size L)