For compressible comfort and wet-weather warmth on our multi-day treks, we pack along the Big Agnes Greystone 20 600 DownTek Sleeping Bag. The ultralight, ultra-lofty down insulation packs in heat, while the draft collar and tube lock it in. Treated inside and out to repel moisture, this bag keeps us cozy through condensation drips, and the external loops let us hang it up to dry off completely as we sip our morning brew.