The 200 gsm canvas used on our bushwalking light range (Umbra, Shadow and WBA) has the benefits of Waterloc canvas at about half the weight. (The fabric was previously called six-ounce canvas.) It is made in Australia to cope with our harsh conditions – the sunlight, scrub, and rain – offering high UV and water resistance and good durability.  Although it is much tougher than ultralight nylon, some care is needed: it’s not a great choice for teenage boys!