Big dog. Bigger adventures. The K9 Sport Sack Kolossus is completely redesigned from the ground up to be the most capable large-dog carrier on the market — and it doubles as a full-featured backpacking pack when your dog isn't riding along.
- Carries medium to large dogs 20–80 lbs (9–36 kg)
- Available in sizes L through XXL
- Adjustable shoulder and torso sizing fits all body types
- Converts to a 50–60 liter gear pack when not carrying your dog
- Top-of-the-line safety and ergonomic design developed with vets and outdoor engineers
- Built for strenuous hikes, bike rides, and public transit
- Vet-approved construction for pet and human safety
The Kolossus isn't just a dog carrier — it's your adventure partner. Built for the trails, the city, and everything in between.
Frequently Asked Questions
What size dogs can the Kolossus carry?
The Kolossus is designed for medium to large dogs weighing 20–80 lbs (9–36 kg). It's available in sizes L through XXL to accommodate different dog and owner body types.
Can I use the Kolossus as a regular backpack when my dog isn't in it?
Yes! The Kolossus converts into a 50–60 liter gear backpack when you're not carrying your dog, making it a versatile pack for hiking, camping, and travel.
Is it comfortable to carry a large dog in this backpack?
Yes. The Kolossus features adjustable shoulder and torso sizing along with an ergonomic frame designed to distribute your dog's weight comfortably across your body, even on long, strenuous hikes.
Is this carrier safe for my dog?
Absolutely. K9 Sport Sack carriers are developed under the close direction of veterinarians, dog trainers, and outdoor product engineers to ensure they are ergonomic, safe, and secure.
What activities is the Kolossus designed for?
The Kolossus is built for strenuous outdoor activities including hiking, biking, and public transit. It's the go-to carrier for serious adventurers with large dogs.
