The problem I've had with big square bags in cold weather is the foot box. It's too big and gets cold spots. I jam a shirt or jacket down there to fill in the corners
I have a Coleman Big Game sleeping bag. It's big and warm.
Check out the Coleman Big Game sleeping bag - its rated to 0°F, fits people up to 6'5", costs around $80, and the fleece lining is way more comfortable for extended laying than most camping bags.
The temperature ratings on higher end bags will adhere to an industry standard, namely ISO 23537/EN 13537 which specifies the testing requirements as well as provide you with a comfort, limit and extreme temperature rating.
From what I can see, Coleman doesn't seem to provide that so you'll be forced to trust their marketing numbers. For example, the ISO/EN tested bags assume you are wearing a warm base layer, hat and using a sleeping pad with a R4.8 rating. Who knows what Coleman is expecting you to be using?
If you go with the Coleman, make sure you test it out before you use it on a trip. Set it up on your deck or balcony and you'll know within 15 min whether or not you made the right choice.
Not who you asked but I'd consider Kelty to be a lateral move from OP's current Coleman. Both make reasonable bags for car camping, but not anything I'd want to carry. Personally, I use a 32 degree Marmot bag for backpacking and it replaced(and is actually warmer than) a 0 degree bag from Kelty. The UL crowd really likes quilts instead of a traditional sleeping bag so that might also be worth considering.
I'd also mention that the sleeping pad is a major factor in warmth so don't forget that. I bought a Neoair when they first came out and that made a huge comfort difference for me compared to the thin foam pads I had before.
Breathable fabric, Water resistance, true temp bag
You would die in a Coleman 0° bag if it had to be in 0° weather. Pack size, weight, durability of the fabric, filling ( down, synthetic, some cheap ass material).the cut of the bag or style
I bought a Coleman 0 deg sleeping bag at Ocala FL Walmart back in the early 2000s. Was out on an impromptu weekend and needed a bag. I think I paid $40 for it. It was actually a great bag and I still own it. I quit using it bcs it is a synthetic fill 0 deg bag and doesn't pack down small enough for my pack. But for car camping 100%. Never found another one like it. Loved it!. Worst case, you don't have a ton invested. Although, you can find several comparable bags for around the same price. We have so little faith in Coleman brand these days and rightly so, but from time to time they actually still make a good product.
Top Outdoor Sleeping Bags on Reddit
1
NEMO
Disco 15 Series
78% positive of 120 users
Spacious for side sleepers; bulky, temp rating optimistic.
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