pannier JOGLE

In August/September I'm planning to ride JOGLE and I was wondering how much pannier capacity I will need. I was thinking around 40 litres or so, but I wanted to know what you guys think. And how much stuff you think I will actually have to take. For reference I will be doing exactly 1000 miles and taking about 14 days as I am touring the country and not racing down.
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camping you need a couple of full size panniers and strap the tent on the rack top and usually have a bar-bag. lightweight tour varies from a seat pack to a small throw-over pannier which I prefer because it gives you a place to stash easily all clothes and shopping in hot weather.
thus
lighter than it looks
camping
http://s189.photobucket.com/albums/z122 ... =slideshow
On a non-cooking, 2-week camping tour I managed to fit a Gelhert Solo tent + bag and pad inside the pannier bag so my rack top was empty.