How can I stay warm tonight?

I'm going to stay out in a field tonight. I can't really take much stuff with me; I can only take a rucksack. What can I put in to keep me warm cos I can hardly put a blanket and pillows etc into it can I? Shall I just wear loads of layers like 2 pairs of trousers and wear coats/jumpers, and try to squeeze a... show more I'm going to stay out in a field tonight. I can't really take much stuff with me; I can only take a rucksack. What can I put in to keep me warm cos I can hardly put a blanket and pillows etc into it can I? Shall I just wear loads of layers like 2 pairs of trousers and wear coats/jumpers, and try to squeeze a blanket in? What do you think?
Update: Don't say don't go lol
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