Mountain Hardwear - Phantom 0F/-18C

I brought my MH Phantom 0 and regretted it. Everyone else rented. For the first 2 nights and then the last night, I had really bad condensation on my bag. Whereas my tentmate and no one else did. I was lucky I could dry it out. I don't know if it's the fabric or down vs synthetic, but all the water in the tent just sucked into my bag. I'd recommend a synthetic bag or more waterproof fabric as an option for this particular environment.

Yeah I use it for general winter camping and other climbs. It's a good bag but not for the lower elevation on Kili where it rains a lot

Hi! For Kilimanjaro’s Lemosho route,, where temperatures can drop significantly, a reliable, high-quality sleeping bag rated for sub-zero temperatures is essential. Here are some suggestions and considerations to keep you comfortable: Temperature Rating: Since you’ll be climbing in December, temperatures at the higher camps can drop well below freezing, especially at night. A sleeping bag rated to at least 0°F (-18°C) is ideal, which aligns with your selection of bags. Roominess: Given that you prefer extra room to side-sleep and store water bottles, look for bags with a semi-rectangular or roomy mummy shape rather than a standard mummy bag, which can feel restrictive. Some models from Rab and Sea to Summit are known for offering a bit more space without compromising warmth. Recommendations: The North Face Inferno 0: Great choice for extreme conditions, known for warmth and durability, but it may feel slightly snug as it’s a true mummy bag. Mountain Hardwear Phantom 0: A lighter option that provides good warmth, though it’s still a bit narrow. Great if you want something compact and ultralight. Sea to Summit Spark 0: Lightweight and compact, but might be on the tighter side, so check sizing. Therm-a-Rest Parsec 0: Another strong contender for warmth and quality, and it’s slightly more spacious than typical mummy bags. Budget: With a $750 budget, these options fit well, but I’d recommend prioritizing warmth , waterproofing and comfort over compactness if you have porters carrying your bag. Additional Tip: Bring a sleeping bag liner for extra warmth, and if possible, a small foam pad to add insulation against the ground, as the tents and ground can get quite cold. Have a fantastic climb on Kilimanjaro!

My current down mummy one from Mountain Hardwear that I got for a crazy deal (<$90). There are zippers on both sides and the toe area. I move a lot in my sleep, and the slightly wider area up top makes it easier. (It's wide enough for my arms to go to my shoulder area, even zipped up.) It's a huge step up from my previous one, a cheap synthetic mummy.

Mountain Hardware has a couple bags that are compatible, my wife and I use them. They are a little bulkier, but affordable. You could also look at something like the Zenbivy Double bed.

I have the Mountain Hardwear and love it. My kid has a North Face Inferno and loves it… and I worry less about water damage. I trust OutdoorGearLab.com for reviews. 

It's really a personal choice. I would suggest you try the MH sleeping bag. It's a free way to test a type of sleeping bag. Worst case, you buy another one later. I personally use down sleeping bags because they are lighter and compress better. But they are more expensive and take a lot longer to dry if it gets wet.