In reply to Dane1: Great review, Dane, and thanks for bringing my attention to this brilliant new sac. It looks like the perfect minimalist multi-pitch / alpine daysac. I really like the "less is more" approach Blue Ice have taken in terms of aesthetics and features also the net result of this on the weight of their products.
Lakes Climber in Ambleside are one of the few UK Blue Ice stockists, so I popped in there to check the Warthog out for myself this morning. As Dane suggests, it's not easy to pull off products that are this simple really well, but Blue Ice appear to have done it. I bought one there and then, but be warned: I gather there aren't that many in stock out there.
I've loaded it up to check out whether the volume is ok, and it comfortably swallowed: my harness; chalk bag; rock shoes; light shell and fleece; half a rack; a half rope under the lid; a guidebook in the lid pocket; and a helmet under the 'hairnet'. Seems like a little belter.