As I'm going to need one for the Hardmoors 55 I thought I'd ask what other folk carry for these sorts of events.
My old Karrimor bag weighs nearly half a kilo but I'm sure it's pretty effective. I would prefer something lighter but one that will still be reasonably effective should I actually need to use it.
Are lightweight mylar bags a waste of space in terms of effectiveness (like this one) or are they "good enough"?