REI Co-op - Trailmade 20 Sleeping Bag

The Zephyr is going to pack much smaller than the Trailmade. I wouldn't recommend the Trailmade for backpacking - it's just too bulky. You are asking for a hard combo... quality + cheap + warm + light Down insulation is best for backpacking. Synthetic is never going to pack as small/light as down.

If you want light weight, small packed size and good temp rating… the magma by REI is the best bang for the buck… because of the size choices. If that is to much… The Trailmade is super inexpensive, and comes in a variety of lengths and widths. It is not as light, nor as compactable. If you were in the store, I would ask a whole bunch of questions… side, back or stomach sleeper? Do you roll? Where do you normally get cold? What is the likelihood of the bag getting wet? Etc… etc… I’d ask because there are so many options and each kind of sleeper works with a different kind of bag. But if you want the lightest and most compact… and best bang for the buck… the magma is the way to go? also do not forget to buy or make a liner. No sleeping back should be used without one!

I got myself an REI Trailmade 20. I've been very happy with it as far as size, warmth, and it's relatively affordable.

None of those are super budget friendly, I got a rei trailmade 20 that yes is kind of bulky but was only 70 bucks at memorial day

There's a difference between comfort and limit ratings, my REI trailmade 20 is limit rated to 20°F but comfort rates to 31°F so I really don't take it into anything below 35 or so. I would get a warmer sleeping bag for colder temperatures

Prepare for a torrent of recommendations. My $0.02: buy the cheapest, and if it doesn’t work for you, or it breaks, then upgrade. Nothing wrong with an REI flash backpack, REI half dome tent for 2, and an REI trail made 20 sleeping bag