Timbuk2 Lightbrite Swig Backpack (OS) Fabric Lightweight coated water-resistant nylon with water-tight flap construction. Reflective stripe ensures you stay visible when riding at night Timbuk2's trademarked Swing Around Access; grab your laptop without taking off your pack. Padded, low profile internal laptop compartment for full protection without the bulk Lightweight ergonomic shoulder straps are designed to fit people, not robots