Cato Rolling Backpack Navy Blue. The California Pak 'Cato' rolling backpack is a backpack built to last. The rubber bottom rolling backpack has a variety of features and pockets, including a retractable single pole, high performance inline skate wheels, and protected steel twisted zipper pulls. The rubber bottom gives the backpack a toughness and water resistance that other rolling backpacks pretend to have, and it comes with a t