Plus 2 Sport Sack Dog Carrier - Camo BlueK9's Plus 2 is a backpack dog carrier with a multi functional, detachable storage pack. The storage pack is ideal for gear, treats and other essentials when you head off on an adventure. It also acts as a support for your dogs back, pulling your pup in snuggly against your back. Available in sizes S L, its thicker shoulder straps and padded back panel allow for more weight and strenuous activities. The Plus 2 is perfect for small to medium sized dogs