Removable and washable foam block: Ensures easy cleaning and long-term hygiene for your dog
Interchangeable sizing: Allows flexible fit for dogs in between sizes or growing pets
Snug fit in K9 Sport Sack: Provides extra support and comfort for your dog during travel or outings
Two blocks can lift up to 6 kg: Offers reliable support for a variety of dog sizes
Durable construction: Made from quality foam and fabric for repeated use
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
Height
7.62 cm (3 inches)
Width
15.24 cm (6 inches)
Weight capacity
Up to 6 kg (13.2 lbs) with two blocks
Compatible with
K9 Sport Sack backpack carriers (XS, S, M, L, XL, XXL)
4.6
131 ratings
5
4
3
2
1
Expensive and poor fit.
J
Johan · 11 days ago
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.