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Camping in winter

No.1593180 ViewReplyOriginalReport
Winter is coming - it's time to start collecting gear for camping in lower temperatures.

What things are a must have for camping in snow for 2-3 days?
Do I need a new tent or is my shitty, cheap, summer tent enough? Or is getting a hammock a better, warmer idea?
I don't want to start any camp fires or to spend more than 50$ on a sleeping bag - am I going to die when temperature will drop to -30*C?
Any other tips, suggestions, things you wish you knew before you started camping in winter?