The Knavigate is a combination of all the best features from K9 Sport Sackfts 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. Rated for 50lbs. Product 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 * 30-day money-back warranty.