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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?
cmyj-
I think a good mat will probably be warmer than your car seat. My thoughts on mats here: https://www.lfgss.com/comments/16503447/
I'm currently using Expeds, a Synmat for summer and a Downmat for winter.I've got 2 of the Alpkit Pipedream bags too, a 400 for winter and a 200 for summer. The 400 has done me down to -4°C, and I reckon it's about as much as most folk will need in the UK apart from proper winter mountaineering. I'm 178cm tall, 83kg, and tend to sleep a little bit cold.
Try putting your coat outside the bag, over your legs. This adds insulation, while letting the bag trap warmth from your body. Also, buffs, woolly hat, gloves can help and are easily put on or removed.
Bearlegged
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?