I like synthetic insulation systems, as they are less expensive, not as susceptible to moisture as down, and in this day and age can be made essentially at the same weight point as the down counterparts (e.g., Marmot Elite sleeping bag series). The only problem with the synthetics is that it doesn't compress well enough and eat a substantial chunk of the backpack space.
As technology keeps getting developed, the last statement may not be as accurate today as it was a few years ago. Are there any synthetic sleeping bags in 20F and 0F categories that compress well. My reference points are Marmot Trestles Elite 20 (an older, not an Eco version), and Trestles Elite 0F (also non-Eco version). I am happy with both until I start packing them.
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