K9 Sport Sack® Plus 2 Backpack**Please measure your dog before ordering to ensure the correct sizing. Measure from collar to base of tail** The Plus 2 is a backpack dog carrier with a multi functional storage pack. The storage pack is great for bringing gear, treats, or other necessities along on your adventures. 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