Bomb Shelter FlyBomb Shelter Fly The Bomb Shelter Fly incorporates Durathane haul bag material into the top cap and an aircraft quality 6061 T6 aluminum clip in point to securely anchor the portaledge and insure a leak proof seal. There is no webbing to wick water through the fly. The main body is constructed from durable polyurethane coated 420d Oxford and has all the seams hot taped. There is an aluminum storm pole to create more space inside the fly. A window