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K9 Sport Sack

K9 Sport Sack® Trainer

$42.45 $49.95

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The Trainer is an affordable, easy to use, entry-level backpack dog carrier. Available in sizes XS-L, it is ideal for smaller breeds, dogs that are still growing, training, and learning to socialize. Available in a variety of bright color options, the trainer should be used for short, non-strenuous activities like short walks, hikes, public transportation, and other similar activities. This carrier fits most comfortably on dog owners with a small to medium build.

For Dogs Ranging 4-30 lbs (2-13 kgs)

Sizing chart, measuring the length of your dog from its collar to the base of its tail. Extra Small, 10-13 inches. Small 13-17 inches. Medium 17-20 inches. Large 20-23 inches.

View More Sizing Instruction

  • Lumbar Support Strap (not included on size XS)
  • Ventilated Side Panels
  • Wide Base to accommodate your pet and its tail
  • Side Water Bottle Pocket
  • Padded Shoulder Straps
  • Side Cinch Straps
  • Unique color options

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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: A variety of UPS shipping methods are available. Please allow for 1-2 days of packaging before your item ships, 2-5 days if ordering a waterproofed or custom item.

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 excluding original shipping costs (Also excludes klearance and custom items). Learn more about our policy here.

Customer Reviews

Based on 117 reviews
Bev Steel
K9 Sports sack rucksack

Ordered from the UK - came much quicker than expected and top quality! My pooch is a Cavalier King Charles and the Large is a little big, but a couple of folded towels at the bottom has sorted that.
He loves it and actually thinks he's royalty being carried around!!

Works Perfectly!

We recently got another Golden for service dog training and needed to make sure we started socialization. We also have 2 other dogs that needed their walks and outings and we couldn’t leave the new one behind. This pack pack provided an opportunity to socialize our pup in a safe way before she’d had all her vaccinations. Trips were short - no longer than an hour. Now that she can walk on the ground safely, we still take the backpack with us for when she gets tired and is unable to keep up with the others. We also want to limit how much she does walk as she’s just 3 1/2 months. It only took a time or two before she figured out what to do to make it easier to get her into the backpack. And she gets excited when she sees us take it down from the rack.

C Wallace
Best dog pack

Our Aussie pup now gets to go for morning hikes with us. Started her at 9 weeks in a Large K9 back sack with a homemade bolster. She is growing fast and getting more used to it, although she prefers my smaller back rather than my husband's so that she can look over my shoulders better. At 11 weeks she still needs the bolster but is filling it out more. Photo is at 9 weeks & 12 lbs.

Perfect for my floof

I am so pleased with how comfortable my dog is in this sport sack! She is a 15lb pom mix and I struggle to find a comfortable carrier for both of us. We took her for a spin today and she was just happy as could be. As she continues to age, I know this will be a godsend.

Malia Tano

I was originally looking for a backpack for my corgi because she can’t keep up with my big dogs. The medium size fits her perfect. I originally got the large because that’s what they said would fit a corgi but it was WAY too big for her. The medium works great and she really likes it.