Shopping Cart

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 (Excludes klearance and custom items). Learn more about our policy here.

Customer Reviews

Based on 93 reviews
So happy

I got to take my little Donut on our adventure to Yosemite in the trainer sport sack! It was a huge hit with the hikers around, and I’m so happy I get to bring my baby everywhere! The backpack was a bit big for her, so customer service sent me a block for the bottom which was amazing. 10/10 recommend!

Love our packs

So nice to adventure and not worry if they are secure and comfortable! Especially our senior jack Russel who is 14 years old. Thank you for This product

Longer Walks

It took a few tries to get the hang of the backpack and to get the right size. Now we are building up time walking with Crystal in the new pack. 18 lbs is a lot in a backpack! I am looking forward to building strength, endurance and most importantly - more time with my 10yo Shih Tzu pup. So glad we found a fit!


My Spoo can go anywhere with us right now till she gets fully vaccinated. Then we will have it when she is tired and can't walk anymore!!! Fits perfectly


This is my 3rd Boston Terrier and always had another brand backpack for them. Problem was they didn’t sit well in it as they were positioned sideways. Randomly I found K9 Sportsack and I’m so happy! I got the trainer for the new puppy and will upgrade after a year when she’s full grown. I have the bolster block in there and had no trouble getting her in. I have larger dogs that I take for 3 mile walks every morning and little 9 week old pup couldn’t hang—she walks about a half mile and wants to get in her bag. The only thing is chest straps should be standard on all models, besides that, zero complaints and all praise.