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@Velocio
Just remembered these:
http://www.platypushydration.com/product_detail.aspx?ProdID=2
I haven't used them on bike, but I've used them for orienteering and they work brilliantly.
They'd be really good in a bag, and they don't leak at all.
You can pick them up in one of the camping shops just South of Covent Garden... Ellis something-or-other.