You want to take your dog with you as much as possible and dogs always want to go! A K9 Sport Sack is a great solution for both of you. If your dog is in between sizes, has a wide body but short in length, or is still growing, the K9 Booster Block fits snuggly in the bottom of your carrier. The Booster Block is an insert for the K9 Sport Sack which adds 3 inches of height. Made of high quality foam and removable, washable cloth. It helps make the backpack experience more stable and comfortable for you and your dog. The block size correlates with the size of K9 Sport Sack. The K9 Booster Block is designed to be a tight fit in the K9 Sport Sack to ensure a snug and sturdy fit while in use. While using 2 blocks for 6″ addition height is fine, we do not recommend using more than 2 Booster Blocks. Want to upgrade your dogs adventure take a look at the K9 Sport Sack backpacks. Get a collapsible water bowl that attaches to the carrier.
XS/S are interchangeable between XS and S sized backpacks
M/L are interchangeable between M and L sized backpacks
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