Traveling with kitty can be a stressful experience, so anything you can do to help ensure his and your physical comfort is crucial. The Sport Backpack on Wheels is both an ergonomically designed backpack and a wheeled carrier. If your hands are full, simply carry it on your back. If it starts to get a bit heavy or cumbersome, just pull out the handle and wheel it around. The interior features removable plush inserts so your cat doesn't have a bumpy ride. And to ease the dreaded entry into the bag, the Sport Backpack on Wheels has top and side zippered openings.