While there's no padding, which would suck for flying, theyre definitely no worse than the ultralight bag posted above.
Theyre also light, come in sizes big enough to hold a frame and wheels, and look nothing like bike bags, which is ideal for those awkward "no bikes allowed" bus/train journeys. And theyre only £2.50...
You'll probably find this in the polo thread, where we've all been using them, but for cheap/light bike bags, you cant beat laundry bags.
Ideally this kind:
http://www.thesun.co.uk/sol/homepage/news/article1506697.ece (sorry about the Sun link. Damn Google images..)
While there's no padding, which would suck for flying, theyre definitely no worse than the ultralight bag posted above.
Theyre also light, come in sizes big enough to hold a frame and wheels, and look nothing like bike bags, which is ideal for those awkward "no bikes allowed" bus/train journeys. And theyre only £2.50...