The Plus 2 Dog Backpack by K9 Sport Sack is designed for comfort and functionality, featuring a detachable storage bag measuring 14.0" x 9.0" to keep essential gear handy. Its fully ventilated sides promote optimal airflow, while the padded back panel enhances comfort and cooling during use. The backpack is equipped with thicker, wider shoulder straps that relieve pressure, and mesh dual side pockets for added ventilation. Newly introduced features include a wide base to accommodate pets and their tails, adjustable side and back cinch straps for a secure fit, a fur flap to prevent zipping in your dog's hair, and an adjustable collar enclosure. Suitable for dogs weighing between 8-40 lbs (4-18 kgs), the sizing options are as follows - Small (13.0-17.0 in), Medium (17.0-20.0 in), and Large (20.0-23.0 in).