I've got a fantastic winter sleeping bag (ME TDS 3) which I love but I'm after a summer one now as the the TDS 3 isn't exactly the most packable. For my BDay I've just got an ME Firewalker Ultralight, does anyone know anything about these as the only thing thats concerning me at the moment is the comfort rating is only +5 and these are normally over rated and I'd rather have something that went to 0. Any ideas or other suggestions?