I've recently bought a Mountain Laurel Designs Trailstar and even though I'd have to carry walking poles (400g for the pair), I'd now consider taking it bike touring purely for the amount of usable space you get for the weight. I think it's even got more than my Nallo 2 GT and only weight 450g. The Trailstar, Oookstar nest and poles come in around the same weight as my Akto.