Which is warmer, the Kelty Cosmic 20 or the Marmot Sawtooth?

The Marmot Sawtooth. It is rated to 15°F with 650 fill down, against 20°F and 550 fill for the Kelty Cosmic 20.

Which is better for backpacking?

The Kelty Cosmic 20 is about 11 ounces lighter at 2 lb 7 oz and packs into an 8 x 14 inch stuff sack. The Marmot is warmer but heavier at about 3 lb.

Is the Marmot Sawtooth worth the price difference?

It is actually cheaper: $144.67 at REI versus $179.94 at Amazon for the Kelty as of November 5, 2026. You pay less and get a warmer rating.

Which bag suits side sleepers?

The Kelty Cosmic 20. Its semi-rectangular shape and expanded footbox leave more room to move. The Marmot's mummy cut is snugger.

Do both have a stuff sack and draft tube?

Yes. Both include a stuff sack and a draft collar or tube. The Kelty adds dual locking sliders for venting.

Both use down fill and nylon shells with similar care needs. The Marmot's higher 650 fill power holds loft with less down, which can slow cold spots over time, but lifespan depends mostly on storage and cleaning.

Kelty Cosmic 20 Degree Down Sleeping Bag vs Marmot Sawtooth Sleeping Bag

The Marmot Sawtooth is the better value here: it is rated to 15°F, has higher-loft 650 fill down, and costs $144.67 at REI as of November 5, 2026, versus $179.94 at Amazon for the Kelty Cosmic 20. Choose the Kelty if you want a lighter bag with more room and a semi-rectangular cut. Choose the Marmot if warmth per dollar and a snug mummy fit matter more than the extra 11 ounces.

Today the Marmot Sawtooth Sleeping Bag costs $35.27 less at its best price.

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