SOG Evac Sling Backpack CP1001G Grey, 18 L Stowable Stabilizer strap keeps the pack in place during strenuous activity Top & side access main compartment allows for quick access to any part of the interior Pass-through side access laptop compartment that doubles as hydration carry 2mm PE sheet suspension to distribute weight for comfortability Kodra 500D Nylon material with a polyurethane coating