Sept JMT Quilt or Sleeping Bag

We usually have a cold snap in September when night time temperatures at the high elevation falls into the teens. I'd go with the Marmot bag.

I bought a bunch of stuff from Go-Lite before I new of the other boutique suppliers and almost all of their listed weights were heavier than they listed. Just something to consider.

I used the Golite 20 quilt on my jmt thru in the end of July this year. Was super warm the whole trip, but temps were quite warm. I'd guess low 40's most nights with a couple nights that we got frosty bags at higher elevation. Depending on how cold you get, you might be fine in the golite with additional layers.

I'll be doing part of the Sierra High Route starting mid sept for 8 days and will take my 15degree Marmot. I can open it up like a quilt or zip it all the way up. I'd rather be a little to warm than cold.