Gregory Alpaca Wheeled Duffel 40L Backpack | Travel Backpack from Gregory | TPU coated 900 denier fabric for weatherproof protection and rugged durabilityHybrid design with polycarbonate bottom for lightweight impact protectionExternally mounted trolley handle with seamless, push-button grip with telescoping aluminum handle system for comfortable handlingLightweight 85mm molded wheels with TPU over molded smooth-rolling tireBottom molded bumper that doubles as a grab handleTop molded grab handle with reinforced sewn webbing handles on each sideLarge U-Zippered opening with custom oversized T-Grip zipper pullerInternal compression webbing to tether down, and separate gear.Zippered mesh pocketing on the underside of the top lid for added organization.