Pet Gear I-GO2 Traveler Roller Backpack for cats and dogs Five products in one; carrier, car seat, backpack, roller bag and tote Included tether can be attached to your pet's harness for extra safety Telescoping handle stores out of the way just like a suitcase Sides can be expanded to add 3 inches of additional space; features two side storage pouches for your pet's extras Measures 16"L x 12"W x 15"H