Cosmic Ultra 0

Some tent options https://www.kaviso.com/collections/tents-shelters/products/sierra-designs-full-moon-2p-3p-tent https://www.campsaver.com/kelty-late-start-2p-tent.html https://www.naturehike.com/products/mongar-2-person-ultralight-backpacking-tent Sleeping bag: You're not going to find a sleeping bag that keeps you warm at 20°, packs up to a reasonable size, and costs less than $75. Your best bet is to hope for a deal on marketplace or get a down camp blanket and use it with your current sleeping bag. Sleeping pad: https://www.backcountry.com/therm-a-rest-prolite-plus-sleeping-pad-womens https://www.als.com/sea-to-summit-camp-self-inflating-sleeping-pad-10350624/p https://www.walmart.com/ip/Featherstone-El-Cordion-Insulated-Closed-Cell-Foam-Sleeping-Pad-for-Camping/167563817

Do you actually need a bag that keeps you warm at 20F or are you just looking for a 20F bag? for context most bags are named for their limit rating, where you'll start to feel pretty cold. So for example a Kelty Cosmic Down 20F will keep you warm down to about 32F, that temperature is the comfort rating. The reason I ask is that bags really start to ramp up in price when the comfort ratings get below 32F. 20F limit rating bags (bags that will keep you warm to 32F) are common, 5-10F limit rating bags (what you'd need to be warm at 20F) are not as common

No problem at all. My personal favorite cold weather sleeping bag is the Sierra Designs Mobile Mummy 15, which I've used into the low 20s but I don't think they sell it anymore. You could go two ways with it, you could get one bag that would keep you warm by itself down to 20F, or you could get a sleeping bag and a camp blanket. The sleeping bag would keep you warm down to freezing, then when you add the blanket on top it would give you another 5-10 degrees of warmth. That would also add more flexibility for temp ranges. If you want to go the first route this is the best bang for buck I could find, the upsides are that it's down which means it will pack much smaller than any comparable synthetic insulated bag and is lighter than a 2-bag system. the downsides are that it will probably be too hot for warmer weather camping and since it doesn't have a hood you'll have to wear something on your head to keep it warm at night: https://www.kaviso.com/collections/sleeping-bags/products/kelty-supernova-0-degree-sleeping-bag?variant=45681345462500 If you want to go the second route here are the good bang for buck sleeping bags I found: https://www.rei.com/product/C00655/mountain-hardwear-lamina-eco-af-15f-9c-sleeping-bag https://www.rei.com/product/250709/marmot-sawtooth-sleeping-bag-mens https://www.pariaoutdoorproducts.com/collections/affordable-backpacking-gear-sleeping-bags-pads/products/thermodown-15-backpacking-sleeping-bag?variant=11778285191 The first is synthetic, the second two are down. If you get one of those add a cheap camping blanket from Amazon. Here are some examples, the first one I have and was pleasantly surprised by the quality, the second one I know nothing about but I like the foot drawcord, and the third is one I've heard someone else say they like: https://a.co/d/0bSS6yGR https://a.co/d/0bxxSp2f https://a.co/d/01kbAOW2 It goes without saying that you should do your own research into any of these bags before pulling the trigger, I've only done a cursory review of each.

I just stumbled on this bag while looking at something unrelated, I have the 20F version of this bag and find it to be quite comfortable for me personally. This one comes to ~$172 after applying the coupon. https://www.campsaver.com/kelty-cosmic-ultra-0-sleeping-bag.html

Warmth starts from the ground up. Starting with a good thermal pad. Not all pads are designed for cold temperatures and using the wrong pad is why many people get cold. -15 degree bag should work just fine. That means if you had nothing else but a sleeping bag it would keep you warm at -15 degrees. Adding a good thermal pad will keep you warm. When buying a sleeping bag you will need to consider your height. If you are using a long sleeping bag and you are 5’10” tall, all your heat is going to the empty space below your feet. Getting a bag that fits you perfectly will help keep you warm. I hunt all over the PNW for the past 35+ years. My fall sleeping bag is 15 degrees my winter or late hunt is -15 degrees. Combined with my thermal pad I have never woken up cold. I use a SlumberJack for my 15 degree bag and I use a Marmot. REI Marmot Trestles Elite Eco 0 Sleeping Bag $209 Kelty Cosmic Down 0 Sleeping Bag. Reg $294 on sale $219. I would suggest investing in a better quality thermal pad. Therm-a-Rest NeoLoft Sleeping Pad Or NEMO Tensor All-Season Ultralight Insulated Sleeping Pad **** Best ****

While it doesn't get much colder than 32F on the PNW coast, it's damn wet and windy. Last season I was suffering in my 20+ year old Sierra Designs \[synthetic fill\] so after long research I bought a Kelty Cosmic 0 Down sleeping bag for $165 \[before tax\]. It was on sale for Labor Day, but there are still end-of-summer deals out there. I'm just tent camping at parks, so weight was not an issue. I've always preferred down bags and as a retiree I need the extra warmth.

The typical weather in coastal PNW this time of year is lows in the mid 40s and I used to bring a Sierra Designs 20F synthetic bag, but with humidity at 90% and Pacific winds, it isn't comfortable. A fleece liner and extra blankets didn't make a difference so I now just bring a Kelty Cosmic 0 degree down bag.

Absolutely seconding this, although I'd probably go with the 0° down cosmic. Late season you very well may get snowed on/have some low temp nights where you'll be at OP.

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.