In reply to IceMan1964:
I have an Alpine Attack whicih others have recommended, although mine is 50 litres.
I have to say that although I think its a good design, its let down by poor build quality. Ive had mine about 15 months and the buckle on the rope has broken, so I cant tighten it much any more or it comes undone, which is a real pain the arse. Also, the plastic toggles on the drawcords are very poor and have been worn right throiugh simply by the friction from the cord - they must be made of very cheap plastic, and now they dont clamp on the drawcord properly. One of said drawcords has now (this week) snapped, so I cant do it up quite as neatly now, although fortunately its the lower of the two at the top, so its not essential.
Apart from above, it is a very good sack, I particularly like the floating lid design which is great, and the crampon pocket on the front.
Si