The Knavigate is a combination of all the best features from K9 Sport Sack’s backpack dog carriers. Available in the widest range of sizes, XS-XL, this carrier works for small through large dogs. Each size is equipped with an internal frame as well as a padded hip belt to comfortably support more dogs/owners of all body types. The Knavigate was made for the most avid adventurers and allows for longer, more strenuous activities with your dog. For Dogs Ranging 4-50 lbs (2-23 kgs) View More Sizing Instruction Features * Sizing from XS to XL! * Lap Belt on all sizes * Hip Pockets * Storage Pocket extending underneath the Pet Base to Bottom of Frame * Dog Lumbar Support Straps Compare K9 Sport Sack Carriers View Patent Info Safety 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.