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It was actually just in the back of my van on a seat all night, in my clothes. I was surprised at not being warm, but it's pretty massive in girth so just assume it had too much air to warm up. I like that Rab fills their bags in the UK so can trust the source of the down – would love a recycled down bag but can't find any.
Good to know that's overkill – it's difficult to know which temperature ratings to rely on, but I thought with the Big Agnes system at least if I was hot I'd use one less bag.
I'm sure this is covered in the thread, but are the Alpkit bags any good?
Interesting concept, but as a full system, the temperature ratings look a bit overkill for what you've described, it's quite big and heavy, and the fill power of the down (650) is relatively low. That said, if you were cold in the Rab (with 700g of 650 fill)...?
What mat were you using?