You have your trusty backpack, and now your pup can have one too. The Mountainsmith K9 Dog Pack has a veterinarian-approved torso shape and independently adjustable back and chest harnesses to ensure a custom fit for your canine friend. It has perforated EVA foam and mesh panels for ventilation to keep your dog cool, and offers three different size options to fit any breed or size. DESIGN Adjustable dog pack Veterinarian-approved ergonomic tapered torso shape Independently adjustable back harness and 4-point adjustable chest harness Padded sternum pad, adjustable belly strap, and padded tubular grab handle (2) pannier compartments with zippered accessory pockets Perforated EVA foam and mesh panels for breathability and ventilation Weather/water resistant interior coating Reflective trim for safety D-ring leash attachment point SMALL Dimensions: 9.5" x 8.25" x 2.25" Weight: 16 oz. Volume: 3 L Best for dogs 20 - 50 lbs. with small girth chests MEDIUM Dimensions: 12.25" x 8.25" x 3" Weight: 19.2 oz. Volume: 5 L Best for dogs 40-90 lbs. with medium girth chests LARGE Dimensions: 13.5" x 9" x 3.25" Weight: 22.4 oz. Volume: 9 L Best for dogs over 80 lbs. with large girth chests Additional Details Manufacturer's Lifetime Warranty