Thanks for the explanations.

Your backpack is half the weight of mine .... that's more than two pounds saving ...

And anyway I don't like my backpack ... something wrong with the external pockets, not well designed... (or maybe it's just that I would like to buy another one .. <img src="/images/graemlins/grin.gif" alt="" /> )

About the sleeping bag : I have one with the same design (here, it's called "sarco-norv?gien", IIRC). But it's much to warm to use anytime except in winter ... If weather is fine, I won't need a sleeping bag ; if weather is not so fine or rainy, a light sleeping bag should be enough... I will have to think about it some more .... <img src="/images/graemlins/confused.gif" alt="" />