How much you put in your bag makes a difference. If you're 12 stone, and you walk 9 hours a day at 3 miles an hour you consume 2993 extra calories a day. 9 hours is a lot of walking and three miles an hour is a sustained speed but this calculation assumes no climbing (using Naismith's rule you add half and hour for every 1,000 feet climbing). If you're 14 stone, you consume an extra 500 calories. Now I'm not sure if carrying a bag weighing 2 stone makes 12 stone person the equivalent of a 14 stone person (without the bag) but there must be a rough equivalence. An extra 500 calories a day is a lot, 90,000 calories over the length of the whole walk, or 30 days extra food consumption!
A helpful list for loading your bag is provided on the Confraternity of St James website (for walkers planning for the St James Way walk).
Not sure about the starting premise which says you need a 60 litre bag if your a man and a 35-45 litre bag if you're a woman. I guess it's assuming that you can carry more and that some of the items of clothing are bigger. Anyway 60 litres is a much bigger that any bag I've carried so I must be doing something wrong (or right).
I don't think you need much in the way of clothes. The key thing I guess is to be able to wash them and to make sure sure that everything is made of the latest quick/drip dry synthetic materials. Three tea shirts, shorts/trousers, fleece, waterproofs,hat, something to put on your feet in the evening and socks seems enough to me.
Wasn't much taken by the idea that you can buy specialist clothes with silver threads that can absorb oder for up to three weeks. Is that the same underwear for three weeks?
The suggestion that you rub your boots with wild fennel or mint whenever you get a chance seems like a good idea, particularly if you've been wearing your underwear for three weeks.
Anyway the top tens question I need to answer before packing my bag:
1. How long do socks last, how many miles?
2. How many pairs of socks should I take given that they take forever to dry?
3. How long do boots last?
4. Will I need to wear some boots in before I start or do your feet change shape after so many miles walking?
5. Will my clothes last 180 days of walking, or will I need to be sent supplies?
6. Given that I look like an idiot in a hat, what sort of hat should I get?
7. What is the very best stuff for keeping mosquitoes at bay? They will already know I'm coming.
8. Should I go modern and get one of those integrated watering systems (intravenous?)?
9. Will I need the same clothes in Austria as I need in Spain?
10.Should I take my ipod?