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Thanks Tom, that's very helpful.

If there is no difference when punctured, then that makes my sleeping bag decision much easier.

On the backpack, I will look at upgrading to a similar model, however I would have to say it's been working fine for me, and the fact that I get hip bruises on a heavy load; is it just me?), is not necessarily related to the life of the foam. I have always got them on a longer trip.

Thanks for all your help,

?Geraldine.