Since it's currently at full price, the Magma is about $100 more expensive than either of OP's choices. The big difference is that has 800 fill power down, where the other two are 600 and 650 fill power.
My daughter recently replaced a synthetic bag she bought while in college with an REI model, and liked their new sizing system. I think she may have bought the REI Magma. I have and like a Big Agnes 650 down bag I've had for years, but at a 15 degrees F rating, it hasn't gotten a lot of use in recent years.
I agree with u/TheBimpo that, unless they are trying to put a full set of gear into a pack of 50 liters or less, OP will do fine with either of their choices.
Yep we have a Big Agnes double as well as two colder weather bags that zip together. Different tools for different applications. When it is super cold a single will be much warmer-especially if one of you sleeps hot and the other is always freezing. My hubby gets claustrophobic if he’s too warm at night so on more temperate trips the BA double allows him to unzip his side so he can ventilate without freezing me
We have a Big Agnes one from 15 years ago and we like it! Just make sure your pads will work with the bag. Ours has sleeves for the pads to fit into, but we upgraded our pads and they no longer fit. Might move to a hiking quilt or something in the future.
BF and I sleep in a Big Agnes double bag with a double pad and with a fleece liner tucked inside the bag. We're medium sized people, and it's quite comfortable. Packs down to a somewhat reasonable size and is pretty lightweight. I solo camp a lot and often use the double bag set-up for those trips too just to have more room and to be more comfortable.
If size and weight aren't a concern at all, I agree with looking into two regular rectangular bags that can be zipped together. I have big heavy ones that were sold as a set. I get a lot of use out of that setup too, including using them with another bag tucked inside for cold weather camping and for using on top of the plastic mattresses cabins tend to have - makes for nice and comfy sleeping. The bag is very big and heavy though - takes up quite a bit of vehicle space and not a feasible option for backpacking.
Biggest recommendation I have is to get one rated for colder than you think you'll need. The extra body heat is nice, but my experience is that it doesn't provide quite as much extra warmth camping as you might think.
anonyngineer
