Removable and washable foam block: Ensures easy cleaning and long-term use
Custom fit for K9 Sport Sack: Provides optimal support and stability for your dog
Interchangeable sizing: Allows use of different blocks for various carrier sizes
Boosts dog up by 3.76 cm: Accommodates dogs with wide bodies or short lengths
Supports up to 6 lbs: Suitable for a range of dog sizes and breeds
Summarized by Shop
Sizing your dog for a K9 Sport Sack® isn't an exact science. If your dog is in between sizes, has a wide body but short in length, or is still growing, the Booster Block fits snuggly in the bottom of your K9 Sport Sack to boost your dog up 3" (7.62 cm). It helps make the K9 Sport Sack experience more comfortable for you and your dog. PRO
Material
Foam, fabric, mesh, plastic
Height added
3.76 cm (1.5 inches)
Weight capacity
Up to 6 lbs
Sizing
XS, S, M, L, XL, XXL (interchangeable blocks)
Dimensions
7.62 cm x 7.62 cm x 3.76 cm
Animal type
Dogs
Summarized by Shop
4.6
126 ratings
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1
I absolutely love the colour I bought, the quality is amazing, and It’s super comfortable while on my back however, my dog cant seem to get comfortable in it. Its the right size bit, just not the pack for him.
I
Iris · April 17, 2026
This is a great backpack for our older 16 lb Havanese. I ordered the medium based on other reviews that the small was snug. It’s very roomie but works well. They were out of the medium booster block so I did a XS/Small that works but leaves a bit of a gap. I would definitely recommend the booster if you size up like I did. There is an extra storage below the main backpack which has decent room for extras.
C
Christina · February 10, 2025
I love this Sport Sack for my dog. He took right to it. He’s comfortable and I watched the videos so that everything would go smoothly when putting him in the first time. He looks straight ahead and loves being right by my head. I tested using the product while riding my e bike. He loves it.