UK - looking for v.large, v.light holdall for panniers
British Airways allows us to check-in one bag only, so I'll have to put all of my bike luggage into a single bag, large enough for 2x front panniers, 2x back panniers, handlebar bag and tent. I've managed to find a large, clear, ripstop nylon 'sack', which would do the job, but I just know that some idiot Customer Service Operative will try to stop us getting through because it doesn't have handles or something. So I'm looking for a very large, lightweight, nylon holdall-type bag which will compress down to something that's easy to carry on our tour. Anyone know of such a thing in the UK, preferably one I can order online?
I'm sure I've seen this kind of thing in LOADS of places, but now that I have a need for one, I can't find it anywhere!