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K9 Sport Sack

K9 Sport Sack® Trainer


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.

All sizes rated to carry up to 30 lb (13 kg)

  • 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

Compare K9 Sport Sack Carriers

View Patent Info


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: USPS Priority Mail shipping (average delivery in 2-5 days unless alternate method is selected). UPS 2nd Day Air shipping is also available.

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 104 reviews
Pia Ribes
It fit my fluffy Maltipoo just fine

It fit Bruno so well and I can’t wait to take him cycling with me.

Todd Adler
Great for exploring the city

I have a 14# mutt that gets tired after about a mile of walking. I ordered this pack for him, and got it today. I put him in it per the videos, and he went in with no fuss. We walked 4.5 miles and he looked like he loved every minute of it!

Could have probably done a medium, as he is at the edge of the size small. All and all a great purchase.

Bikin' Willie

We absolutely love the pack and so does Willie! We were a little nervous because he is 35 lbs but he fits and holds in the pack so well. I love the spot for the front paws to hang and it helps secure him more 10/10 recommend

Tried the basic pack

We have a 12yo rat terrier mix and this is the best dog backpack ive ever had, the only one that doesnt hurt my back. I do think even the basic model could be improved with another buckle that goes across your chest or stomach just for added support but my dog only weighs 9lbs and did so well in it she fell asleep. Most carriers she is uncomfortable and wiggly.

Terrific for short excursions

I have taken my 10 pound, 8 year old dog out and about running errands in a lightweight sling carrier, but I got the trainer pack for a recent adventure trip. Wanted the option to carry her in a pack when biking and hiking. She especially loved riding in the pack when we biked — Ears blowing in the wind! Because it’s a cozy fit, the pack swaddles and relaxes her. Normally she can be an anxious dog when we go to new places, but in the pack she was relaxed. An added plus! I would consider getting the Air 2 sack if I did more rigorous adventures, but the trainer is good enough for our short trips. I’m 6’ and my dog fits in a small sack; although it was comfortable for me, I think an Air2 would be an even better fit.