K9 Sport Sack Dog Carrier Booster Block, Medium/Large

By K9 Sport Sack
Rated 5 out of 5 stars
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$9.95Chewy Price
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$12.95Chewy Price
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About This Item

  • Specially designed to fit snuggly at the bottom of the K9 Sport Sack Air Forward Facing Backpack Dog Carrier.
  • Adds 3 ½ inches of height so your pooch can sit more comfortably in the backpack.
  • Built out of high-quality foam so it can stand up to heavy-duty use through walks, bike rides, rucking sessions and more.
  • Comes with a removable cloth with zipper so you can keep it nice and clean for your pup.
  • Great for dogs who are in between the available pack sizes, including shorter dogs, growing pups or canines who are short and stout.
Play Video: Learn More About K9 Sport Sack From Our Team of Experts
Learn More About K9 Sport Sack From Our Team of Experts

Although your dog might want to use it as a doggie yoga block, it’s designed to work with the K9 Sport Sack Air Forward Facing Backpack Dog Carrier.



Questions & Answers

5 Customer Questions


What is the weight of this booster block?

Would it work in the small k9 sport sack plus 2?
Answer by ChewyNov 01, 2020
This booster block is made to fit at the bottom of a medium or large bag. So it would not fit in a small bag.

Would the backpack and booster seat work for a 13lb Main Coin cat?
Answer by ChewyJan 04, 2018
The Small can hold 8-14 pounds, the Medium can hold 13-20 pounds, and the Large can hold 20-35 pounds.

will the large booster block fit in the medium sportsack ?
Answer by ChewyJun 10, 2020
The large booster will fit into the medium sack.


ReviewsWrite a Review

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5 Customer Reviews



Rated 5 out of 5 stars
By Mona on May 27, 2022

It works like a champ!

We tried a small and she couldn’t fit into it and then a medium and she still didn’t fit so I purchased this block and now she fits! I’m really happy!


Rated 5 out of 5 stars
By flickjilma on Mar 6, 2018
Top 100 Contributor

I didn't use it for the knapsack

I put 3 of these in a pillow cover. My newest kitty is an adult but very tiny (he was a stray so maybe stunted growth?). I wanted a thick foam but not one he would sink into. My other cats can sit in their room and look out the window. He couldn't. ..till now.


Rated 5 out of 5 stars
By SJBern on Apr 10, 2018

Very comfy

Makes the K9 Sport Sack very comfortable for my miniature poodle.


Rated 5 out of 5 stars
By Carrier on Feb 3, 2018

Don't leave without me

I'm glad that I got the booster for fozzie so that he would have leverage while sitting in the sport sack. He still has a lot of room inside the sack.


Rated 5 out of 5 stars
By hugo on Nov 12, 2017

Good for the bag

Bought the bag a little big since my dog is still growing, this booster makes him fit in it. I recommend just getting the booster instead of using a rolled up towel, since the booster fits so much better.