“This setup worked fine but there were a few cold nights in February and on into March, but nothing unmanageable. I kept the 20 degree bag through the whole hike and didn't regret switching it out for something rated to be warmer as summer came on.”
We found a handful of genuine owner reviews (below) but not enough to publish a reliable recommendation score. We'll add a score as more verified owner reviews come in.
“This setup worked fine but there were a few cold nights in February and on into March, but nothing unmanageable. I kept the 20 degree bag through the whole hike and didn't regret switching it out for something rated to be warmer as summer came on.”
“I’ve slept in 0deg Celsius temps no clothing and was still too hot 😂. So I’ve added a sleeping bag silk liner (114grams) so I can leave the bag unzipped if I feel I’m getting above my own comfy sleepIng temp :)”
“I own the spark 3 it's rated to 18F and packs down small & fits nicely in my 35L bag.”
“I can’t answer exactly but I have the 15°F sea to summit spark, long, and it kept me warm down to 3°F. Granted not at altitude but it’s very warm and very light. Mine uses a 13L stuff sack that compresses down to about 9L or so.”