Hyperlite Mountain Gear 2400 Southwest 40L Backpack - 2441cu in Material: Dyneema Volume: 2441 cu in Support/Suspension: Dyneema Hardline, removable aluminum stays Shoulder Straps: sewn-in spacer mesh, 3/8-inch foam Waist Belt: yes, 1/8-inch foam, 3/8-inch foam, spacer mesh