In reply to Neil Williams:
For what it's worth, my big Lowe alpine Cerro Torre bag weighed in at 22kg when chockablock with stuff for a 10 day trek. I agree that 38kg will require bricks
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To those talking about weight - don't forget a tin needs a tin opener (unless you have one on your knife), but you may be able to eliminate a cooking pot unless you need it for something else. The way I see it is like this:-
Pros - tins can be eaten cold & quickly if necessary, can taste nicer than dried food and are normally cheaper than dried food.
Cons - dried food + water is a more versatile combo (the water can be used for other things like 1st aid and drinking), and dried food is lighter if you're able to obtain water at camp without additional weight of a purifier. Tins are also bulky.
Personally I think tins are acceptable for the 1st night of a multi-day thing, but I tend to use supermarket dried food - a double helping of 'Mugshots' makes for a good main course.