Pack the Rufffwear Palisades Packs removable saddlebags with a few days worth of dog food, fill the hydration bladders, and use the five-point-adjustable harness to secure this pack on your pup. Two side-release buckles connect the Palisades Pack and harness, allowing the chassis and the saddlebags to easily separate for fitting, water crossings, and rest stops. Two hydration bladders, one carried in each side of the pack, carry water and cushion your dog from gear and food within the pack, aid in keeping the dog cool, and can be used to balance the load from side to side. Measure around widest part of rib cage for girth measurement. If your dog is in between sizes, choose the smaller pack.