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K9 Sport Sack | Kolossus Dog Carrier Backpack for Small and Medium Pets | Front Facing Adjustable Dog Backpack Carrier | Fully Ventilated | Veterinarian Approved (XX-Large, Kolossus - Green)

Free shipping on orders over $29.99

$274.95

$ 99 .00 $99.00

In Stock

1.Color:Black


2.:Large


About this item

  • The K9 SPORT SACK Kolossus LARGE is perfect for dogs weighing up to 80 lbs. Ideal for breeds like Corgis, English Bulldogs, Brittany Spaniels, and Standard Schnauzers, this backpack is versatile enough for all sorts of adventures—whether you're hiking, biking, shopping, or even skiing. ..heck the possibilities are endless!
  • RUFF LIFE: Do you hate seeing big, sad puppy dogs eyes as you walk out the door for an adventure, leaving your best friend behind? Our dog sports backpack are ideal for owners who have dogs who suffer from anxiety, depression, or have a physical disability. Our pet backpack are also great for older dogs or puppys that may not have the stamina for your next big adventure. Our dog carrying backpack is designed to keep your dog safe and secure. Its the ultimate dog backpack for hiking!
  • ROUND TALL FAT SMALL: We get it! Dogs come in all shapes and sizes, and not every pet travel bag fits the same. We have your dog covered! Our dog travel carrier is available in multiple sizes from X-Small to XX-Large. We have a dog carrier bag that will fit almost any dog breed. Scroll down in the product description to find the right size for your dog! Please contact us and visit our website for more accurate sizing recommendations.
  • SPORT SACK IS THE NEW BLACK: (Tip) For all the chubby dogs out there with a few fat rolls over the collar, our Jet Black is very slimming! Jokes aside, Jet Black is just 1 of the 4 stylish colors we offer in the Sport Sack URBAN 2, and don’t worry all the colors have a slimming effect!
  • USA-BASED COMPANY: Wrong size? No problem. Any issues? We’re here for you. Whatever the problem may be don’t worry we’ll cover it, but we’re happy to hear any good stories and see your adventures with your dog.



Product Description

dog carriers for small dogs carrier front pack medium pet travel large backpack
Kolossus Intro
Brand Intro
Kolossus size guide
Kolossus Feature List
Kolossus Size Comparison

Grant Fox
Reviewed in the United States on March 14, 2025
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Natasha Bull
Reviewed in the United States on February 19, 2025
Super, amazing, the best! Great for our medium sized dog (ESS for reference). It’s sturdy and made from good quality materials. Great for hikes, city and transport. Comfortable and wide shoulder straps for better weight distribution. Highly recommend.
Teddy
Reviewed in Canada on June 22, 2024
We measured our dog and looked the size chart. we bought the size XX-large. Nope. Too small.. now I have to pay the shipping costs $60 to return this item. BS.
Kat
Reviewed in Australia on May 21, 2024
Excellent quality with great padding around shoulders and waist.
Max
Reviewed in the United States on November 20, 2024
I like this dog carrier, it is well made and after I manage to install my pup in it (not an easy project) he seems comfortable. However, it is quite heavy on its own and that makes it a little bit of a challenge when I add its weight to my pup’s 60 pounds.
Justin
Reviewed in the United States on October 6, 2024
Used this twice for my dog and the zipper broke. The pack is only 2 months old and amazon says the return windo is closed. Total waste of 300 dollars.
Carole C Gwathney
Reviewed in the United States on July 27, 2023
Expensive but worth every dime. Staffie is close to 60 lbs and fits well. I can’t carry him on my back for too long, I’m 68, but it does the job when it’s too hot. Also has small removable back pack that works great. Highly recommended.
Rico
Reviewed in Australia on February 26, 2023
All the photos of big dogs in these are cute and all but I'm not a big guy and my dog weighs more than a third of my total body weight. So although it's possible to take your dog, it's also not at all a good idea especially if you have any existing back issues.Shame it's well made but I have several other expensive bags and it does not feel $500aud well made.Side note but this was the second bag I ordered (XL, L did not fit my female Samoyed)Dog is the most tolerant bean ever but still did not enjoy this at all and getting her in and out of there is completely unintuitive. Videos from the company are confusing and for some reason this product was renamed so it's hard to find easy to understand guides at all.
Raingirl
Reviewed in Canada on December 24, 2023
If your in Canada this is where to buy this product. Fast shipping. Held my large dog and took her for a ride. I'm very impressed with the whole idea.
Customer
Reviewed in the United States on December 15, 2023
I got this as a gift, it was a little small for my dog. So I tried to exchange it on Amazon. It was bought on Black Friday and Amazon told me they would only exchange it if I paid the difference between the sales price and the regular price (~$80) since it wasn't on sale anymore (f#@* you Amazon). I contacted K9 Sport Sac directly and they were happy to do the exchange. The pack seems like it is well constructed and my dog and I are going to have some nice motorcycle trips together :)
Tonya
Reviewed in the United States on April 21, 2023
This is a very well crafted pup-pack. For reference, I have a 65lbs. Staffy / pit / pibble and we bought the XXL size. My boy is food motivated so it was mostly easy to get him in the pack (AFTER watching the tutorial video - make sure you watch that). The pack has lots of support, and I felt like my dog would be very safe in this pack.I sadly returned it because it felt like we may not use it enough to justify the cost, but if you’re a hiker, or carry your dog enough, this seems amazing. I would still recommend it, I just can’t speak on its lifetime of wear or durability. Seems like an amazing product though and would absolutely buy again if I could truly afford it
Alex Spengler
Reviewed in the United States on July 15, 2022
My dog broke his toe and it never healed so we had to amputate the toe. We had a trip planned for Banff National Park and planned on bringing our dogs. We were going to be two weeks out of his toe amputation and we wanted to bring a pack for him since he hasn’t used that paw in awhile. I’m so glad we purchased this for him. It was a two person job to get my dog into the pack but once he’s in he’s snug as a bug. The pack seems very sturdy and it’s comfortable once it’s on you. Follow the measurements given and you should be fine. My dog is 40 lbs and the large fit him with his measurements. I’m so happy they make packs for bigger pups.
ChLCt
Reviewed in Canada on June 19, 2022
Lupin the Gentledog is very comfortable, does not try to get out, he feels safe!
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