Save some real weight.
You could delude yourself into thinking that snapping your toothbrush in half and cutting the edges off your maps is actually going to save you some pack weight, or you could get the Marmot Atom 40 Degree Down Sleeping bag and actually save about two pounds. Being the lightest offering in Marmot's ultralight line, the Atom weighs a feathery one pound six ounces in the regular length, and maintains the lofty comfort you'd expect from a 800-fill down sleeping bag, so you'll stay warm as long as temperature hover above freezing.
The Atom may be light, but it certainly isn't lacking in features. Sure, its Pertex Microlight fabric is light, but it's also breathable and water-resistant thanks to its DWR finish. The down fill has also been treated to repel moisture, so the fibers won't instantly clump and lose insulating properties if the bag should get wet. The Atom is available with either a left- or right-handed full-length zipper with an additional zip on the side, which creates a fold-down feature for those times you're sitting up in your bag, tent-bound and waiting for a storm to pass. To keep the Atom comfortable when it matters most, Marmot used a curved baffle construction to prevent down from wandering during your sleep adventures, and added an anatomic footbox to give your dogs some extra room to run around when you're dreaming about hiking.
- 40-degree temperature rating
- 800-fill down insulation
- Down Defender water-resistant treatment
- Pertex Microlight fabric with DWR
- Mummy shape with anatomic footbox
- Fold-down second zipper
- Curved baffle construction
- Stuff sack included
- Item #MAR00T3
- Q & A
packs small, lightweight
- Familiarity: I've used it several times
This is my go-to bag for all my bikecamping trips. In a hammock I have been comfortable down to the low 50's with a tshirt, shorts, and a pad between the layers and no underquilt. In a tent with fleece pants, socks, light weight down jacket, and wool hat I was on the warm side down to mid 30's. If it's going to be cold I am going to have my jacket, socks, and pants anyways regardless of the bag I bring. I save the weight and pack size of a larger and warmer bag and just wear all my layers. The zipper is good, relatively few snags. The foot box is not claustrophobic and I like the simple single draw for the hood.
*I am a warm sleeper
**I have last years model (2015?) with the horizontal baffles and 850 fill.
I recently took this sleeping bag on a 6-day self-support kayak trip in Eastern Oregon. Size and weight were both critical and this product was perfect! When the temperature got down below freezing the bag was comfortable along with my lightweight down sweater. As we descended the canyon the air temperature warmed up and the bag alone was fine (night temperature around 38-40 degrees). This will be my go-to bag for ultralight trips in the future.