In reply to blackreaver:
I recently bought a Simond Alpinism 22 from Decathlon. You could probably go lighter if you wanted, but it carries loads well for the type of bag it is, sits high, compression straps, rope/ski attachment strap, daisy chain if you need it. Build quality is not quite at Deuter level, but really not far off, and for £20 it's definitely worth a look.