“So far I have used it for 3 hunts with temperatures down to the lower 30s. Tent camping with a sleeping mat and no heat source and have been very warm.”
“My shoulder season bag is the women's marmot trestles elite eco 20°F (note the men's temp rating is different). It's great, again not ultralight being synthetic, but it packs down small for the temperature, is cozy, and not super heavy. I think it's the best for that category without going for down.”
“I got a synthetic marmot trestles elite (womens), comfort rated for 21F and it was def not. I slept in 32 and was freezing so bad i had to go sleep in my car.”
Cosmic 20 Down vs Marmot Trestles Elite Eco 20: frequently asked questions
Is the Cosmic 20 Down or the Marmot Trestles Elite Eco 20 better?
Real owners lean toward the Cosmic 20 Down: 74% of 19 owners recommend it, vs 59% of 17 for the Marmot Trestles Elite Eco 20.
Who should get the Cosmic 20 Down?
Owners point the Cosmic 20 Down at budget-conscious backpackers who want a 20°F down bag without paying premium prices, and scouts, students, and occasional campers needing warmth to the low-to-mid 30s.
Who should get the Marmot Trestles Elite Eco 20?
Owners point the Marmot Trestles Elite Eco 20 at shoulder-season backpackers in 30F-and-up temps, and campers avoiding down and animal products.
What do owners complain about?
The most-cited downside of the Cosmic 20 Down is real-world comfort limit runs closer to 30°F or freezing than the 20°F rating on the label. For the Marmot Trestles Elite Eco 20, it's runs colder than its rating; needs a liner or layers below 30F.