The reality is depends on camping that you do. If you are only doing car camping then you could get away with stacking a 20* set on top of a regular 0* set and go sub temps. If you are backpacking and space is limited then you will have to match and exceed your temps that your looking to go down to. I have taken a regular 20* set and 0* with 3oz of overstuff fill set And got down to -20* with plenty of room to spare.
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