The Berghaus Arete 45 is my winter and alpine sack.
The clips are easily operated with thick insulated gloves on, and the axe attachments are velco with large loops that you can even use when the sack is still on your back.
I had no problem putting all my food, gear and spares in my bag with my helmet, axe and crampons on the outside of the bag.
The build quality is impressive too, really bombproof.
And here it is for £45 -
http://www.gear-zone.co.uk/clearance/clearance-rucksacks/berghaus-arete-45Bargain - grab it while you can!
edit: spelling