
One bag, two jobs: a proper backpack for you, a safe ride for your dog.
The K9 Sport Sack Urban 3 is for owners who don't want to choose between their dog and their daily routine. It works as a fully functional human backpack, with a padded laptop sleeve, expandable side pockets, waist and sternum straps and a contoured back panel, then converts into a supportive dog carrier when your dog needs a lift. Commute, travel light or head out for the day without it ever looking like an afterthought either way.

Key Features
- 🐾Converts between dog carrier and full human backpack - genuinely useful as both
- 🐾Padded laptop sleeve in every size, plus expandable side pockets and MOLLE loops for extra kit
- 🐾Waist and sternum straps with a padded back panel - comfortable for the wearer, even loaded
- 🐾Ergonomic, supported ride - leg openings let your dog sit naturally rather than hunched
- 🐾Dual cinching collar enclosure and carabiner clip plus side-zip ventilation to keep them secure and cool
- 🐾Three sizes (XS-M) - vet-developed and reviewed before every update
Getting the size right
Maximum dog weight: 18 kg (40 lb). This is the Urban 3 model's capacity limit, subject to correct fit; it is not a weight-based size recommendation.
Check three things before choosing: weigh your dog; measure back length from the base of the collar to the base of the tail with your dog standing; and measure chest girth around the widest part of the chest, just behind the front legs. Use back length to choose your starting size, then check chest room and sitting height. Being below the weight limit does not guarantee a comfortable fit.
Between sizes or broad-chested? The manufacturer recommends sizing up where needed and using a suitable K9 Booster Block to achieve the correct sitting height. Ask us for help with your dog's back length, chest girth and weight before ordering if measurements fall between the ranges.
K9 Sport Sack carriers are sized by your dog's back length, so please measure before ordering - it's the surest way to avoid a return.
1. Measure the back length from the base of the collar (neck meets shoulders) 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. If between sizes, size up.
3. Still unsure? Watch the fitting video below or message us on WhatsApp with the back length, chest girth and weight.
🐾 Not sure which carrier to choose? Take our 60-second quiz
Choose by back length; weight is a guide. If your dog is between sizes, size up.
Sizing video
Every K9 Sport Sack is developed with vets, behaviourists, trainers and outdoor-gear engineers, and reviewed by a vet before each update, so your dog's spine and comfort are part of the design. Introduce it gradually with treats and praise, and keep the first trips short. Questions or need a hand with sizing? Message us on WhatsApp.