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Just for comparison, 40L is fine for me for:
In winter for technical day trips (temps from -25 to -5):
3L camelbak, 50m rope (on outside), 2 ice axes and 2 poles (on outside), advanced first aid kit, crampons, shovel and probe, spare gloves, spare hat, 2 meals worth of food, 1l thermos flask and mug, mid layer, down jacket & shell with space to spare.
In summer for multiday trips:
3L camelbak, 50m rope, 1 ice axe, 2 poles, crampons, 1 x spare clothes, advanced first aid kit, 2 x meals, down, shell, rain poncho, hat, gloves, mid layer, sleeping bag liner and still has enough room for my harness and climbing hardware if I decide to stow it rather than wear it.
I genuinely believe, based on my experiences, that if you need more than 40L for a ten day trip without camping or more than 50L if you're carrying a tent, you're packing too much.
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Stonehedge
Personally I would say unless you have good technical kit that is lightweight and packs down small then 40l is a bit small, especially heading into the colder months when you may wish to carry more clothes and a warmer bag.