Marmot Micron 40° Sleeping Bag

The Marmot Micron 40° is a summer mummy bag built around 650-fill-power goose down with a hydrophobic (Down Defender) finish, which helps the loft resist moisture longer than untreated down when conditions get damp inside the pack. A 260 g down charge brings total weight to 620 g, putting it among the lighter summer bags — though the 8°C comfort and 4°C limit mark it as a warm-weather bag, not one for shoulder-season cold. The shell is 20D nylon mini ripstop, the liner 20D nylon plain weave, both DWR-treated — light, but without real rain resistance beyond dew. The full-length wrap-around zipper lets the bag open flat and double as a blanket around camp, more useful for camp use than for treks where every gram matters; packed size comes to about 3.9 L. An interior pocket and included stuff sack round out the feature set. Sized for users up to 182 cm, the Micron 40 suits hikers who want a light summer bag for warm nights and don't want to carry cold-weather margin they won't use.