It seems to me that the tenor of this topic is towards suffering.
I carry a Trangia, down filled mat, kilo bag, down jacket and Teddy in a Macpac Clasic, which gives plenty of room whilst being bombproof. Obviously in colder weather I take extra stuff, like a hot water bottle...........
Including the food, water, tea, coffee and toiletries bag my rucksack weighs about 35kg, so I am easily able to walk five or six miles a day knowing that I am travelling in 4 star luxury.