K9 Sports Sack
K9 Sports Sack | Big Kolossus Dog Backpack 3 Sizes | Black or Green
K9 Sports Sack | Big Kolossus Dog Backpack 3 Sizes | Black or Green
Arrives in 3-5 Business Days
- Accommodates dogs up to 36kg
- Internal frame with padded back panel
- Removable storage/dog back support pack
- Detachable sun/rain hood included
Free UK Delivery
Orders Over £49
No-Hassle Returns Policy
Complete Peace of Mind
Charity Profit-Share
10% Back to Good Causes
Expert Advice
Via WhatsApp
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The big one: a carrier built for medium and large dogs who still love an adventure.
The K9 Sport Sack Big Kolossus is the range's largest carrier, redesigned from the ground up for medium to large breeds. Adjustable shoulder and torso sizing means it fits a wide range of body types, and with up to 60 litres of space it carries your dog and your gear for serious hikes, bike rides and public transport. An internal frame with inner padding keeps your dog supported and comfortable, while the carrier converts into a capable backpacking pack when your dog wants to walk.
Key Features
- 🐾Adjustable shoulder and torso height - dials in to fit a wide range of owners and dogs
- 🐾Internal frame with inner padding and a padded, ventilated back panel for comfort and airflow
- 🐾Removable lap belt with hip pockets and a waste-bag dispenser, plus weight-distribution straps
- 🐾Removable storage / back-support pack with hydration port - up to 60 litres of space
- 🐾Detachable sun/rain hood, side cooling vents and a wide tail-friendly base
- 🐾Tough 300D ripstop - for dogs roughly 9 - 36 kg (20 - 80 lb), available in Large and XX-Large
Getting the size right
K9 Sport Sack carriers are sized by your dog's back length, so please measure before ordering - especially important with a larger dog.
1. Measure the back length from the base of the collar to the base of the tail, with your dog standing.
2. Match it to the size below. Your dog should sit comfortably with their legs through the openings.
3. Unsure, or between sizes? Watch the fitting video below or message us on WhatsApp with the back length and weight and we'll confirm.
Choose by back length. If your dog measures around 23 - 25" (X-Large), message us before ordering and we'll advise on the best option.
Sizing video
Every K9 Sport Sack is developed with vets, trainers and outdoor-gear engineers for an ergonomic, secure, strong fit. Build up carrying time gradually, especially with a heavier dog, and keep early trips short. Questions or help with sizing? Message us on WhatsApp.
Pets Own Us FAQs
Please read our FAQs page to find out more.
For questions not covered in our FAQs, please contact us for assistance
Will I get confirmation of my order?
As soon as we receive your order, we'll send out confirmation to your email address. This means we've received your order in our system, and we've pre-authorised your payment method, ready for your purchase.
I placed my order but did not receive a confirmation email. Why?
If you recently placed your order and didn't immediately receive a confirmation email from us, then there might be a few issues we can look into: 1. Our emails might be going to your junk or spam folder. 2. There might have been a misspelling when you entered your email address during checkout. 3. Your email server has very strong spam filters and is identifying our emails as spam so the emails aren't going through. If any of these are happening, we encourage our customers to provide an alternate email to support@petsownus.co.uk
How long does it typically take for your products to be dispatched?
Our delivery times vary depending on the product and supplier. Please review each product page for accurate fulfilment timeframes. Some items offer next-day delivery, whereas some can take upwards of 10 business days to arrive.
I have specific questions about an item - where can I find this information?
If you've reviewed the information listed on the product page and still have questions, please reach out to us via WhatsApp or email. Please note that some of our most popular products have their own FAQs at the bottom of the page.
Do you deliver outside of the United Kingdom?
We deliver anywhere in the UK (United Kingdom). There may be additional charges for the 'offshore domestic regions' and 'Scottish Highlands': Channel Islands, Isle of Wight, Isle of Man, Scilly Isles, Scottish Highlands, Scottish Islands and Northern Ireland, these charges will be clearly displayed at checkout. If your address is outside of the UK, please contact us for a delivery quote by email support@petsownus.co.uk.
