The Humble-Bee Free Spirit SP is THE LIGHTEST DIAPER BAG BACKPACK in the market. the new edition is made with coated rip-stop that's durable enough to carry all of your personal and parenting essentials without excessive added weight from the backpack. The Free Spirit backpack will be the everyday diaper bag you won't leave home without whether your day is filled with running errands or exploring the outdoors, because everyday is an adventure.