--- title: "Review: Cumulus Lite Line 400 sleeping bag on a two-month journey through Patagonia" description: "The Cumulus Lite Line 400 down sleeping bag on two months of testing in cold Patagonia. How did this three-season sleeping bag hold up in demanding conditions?" canonical_url: "https://gramino.com/blog/review-cumulus-lite-line-400-patagonia" last_updated: "2019-03-17" --- # Review: Cumulus Lite Line 400 sleeping bag on a two-month journey through Patagonia Authors: David Czempka Date: 2019-03-17 The Cumulus Lite Line 400 down sleeping bag on two months of testing in cold Patagonia. How did this three-season sleeping bag hold up in demanding conditions? At the turn of fall/winter 2018, my girlfriend and I decided to set off on a two-month journey through Chile and Argentina – we were drawn mainly by the nature of Patagonia. Until then, we'd been used to packing the classic way: always bringing extra things just in case it got cold, or “just to be safe,” which meant carrying 20-25 kg on our backs. This time we had a lot of trekking planned, and to really enjoy it, we had to change our approach and part of our gear. Besides really weighing every piece of clothing and trimming our existing gear down to just the essentials, we decided to upgrade and buy some new items. So we started by cutting weight from the “big three” – the tent, sleeping bag, and backpack – since that's where you can shed the most kilos for your money. We were headed for the fairly cold and windy south of Patagonia, and even though summer had just started there, we were naturally worried about staying warm. Mainly at night, since good sleep is essential. Since we'd bought the tarptent [Mountain Shelter LT](/p/mountainsmith-mountain-shelter-lt) and were using our tried-and-tested [Therm-a-Rest Z Lite Sol,](/p/therm-a-rest-z-lite-sol) sleeping pads, we didn't want to compromise much on the sleeping bags. We knew our synthetic bike-touring sleeping bags were lightweight, but their thermal comfort was only good on paper. [Therm-a-Rest Z Lite Sol](/p/therm-a-rest-z-lite-sol.md) The [Cumulus Lite Line 400](/p/cumulus-lite-line-400) sleeping bag, which the team had in stock, caught our attention for its price-to-weight (705 g) and performance ratio (comfort 2°C, limit -4°C). We tried it out in person at the Gramino shop, and that sealed the deal. We also paid extra to have another 60 g of goose down stuffed into each bag (the maximum possible). We bought bags with right- and left-hand zippers so we could zip them together if needed. The bags arrived surprisingly fast – in under a week we had our new green beauties at home. Each bag comes with a larger mesh storage sack for home and a small stuff sack for travel. Because it's down, though, we decided to also pick up waterproof [Sea To Summit 8 L](/p/sea-to-summit-ultra-sil-dry-bag) dry bags, which we used to carry the sleeping bags along with our merino layers reserved strictly for sleeping. Merino wool absorbs sweat and body oils well, which keeps the down from getting dirty and losing its insulating properties. - [Cumulus Lite Line 400](/p/cumulus-lite-line-400.md) - [Sea To Summit Ultra-Sil Dry Bag](/p/sea-to-summit-ultra-sil-dry-bag.md) - [Sea To Summit Lightweight Dry Bag](/p/sea-to-summit-lightweight-dry-bag.md) - [Sea To Summit eVac Compression Dry Bag UL](/p/sea-to-summit-evac-compression-dry-bag-ul.md) - [Sea To Summit eVac Compression Dry Bag](/p/sea-to-summit-evac-compression-dry-bag.md) - [Liteway Litebag With Dyneema®](/p/liteway-litebag-with-dyneema.md) - [Hyperlite Mountain Gear Side Entry Pod](/p/hyperlite-mountain-gear-side-entry-pod.md) Nighttime temperatures in Chile ranged from -4 to +20°C (over the trip we covered roughly 2,500 km from south to north). Winds hit 70–100 km/h in places. Even though some mornings we had to shake off a frozen layer from the inside of the tent, once we zipped everything up and cinched the hood, we weren't cold in the bags at all – even though my girlfriend sleeps on her side and I toss and turn quite a bit, which used to be a problem with my old bike-touring bag wherever the fabric pulled tight. The sleeping bag was a bit tricky to pack down in the first few days, but it gradually broke in. Once unpacked from its stuff sack it fluffed up to a fantastic loft, and even after two months of daily use the down stayed evenly distributed, with no tendency to clump or leave cold spots. Early mountain starts often meant packing the bag away damp and unaired, so during the morning we'd need **a break in the sun to let it dry out.** Moisture doesn't just reduce insulating power – it also makes the down go musty. That happened to mine after a while, which meant even more drying time. As for the fabric, at first we were a little worried about snagging it in the zipper. Even though the zipper pull is ergonomically shaped to avoid catching the fabric, I managed to snag it about twice anyway – the fabric held up fine though, so it's fairly tough despite feeling thin. **Cinching the hood is quick and easy.** **The inner pocket** we didn't use that much, but a phone or spare batteries fit into it just fine. We only zipped the two bags together on a few occasions – most of the time we were so wiped out that we were each happy to just crawl into our own cocoon. Overall, without any exaggeration, I have to say these sleeping bags were **the best gear investment we made.** On hard, cold days we genuinely looked forward to sleep and to those fluffy down cocoons. Maybe partly because they reminded me of the fluffy featherbeds we used to have at home from my grandmother. Product tested: [**Cumulus Lite Line 400 down sleeping bag**](/p/cumulus-lite-line-400) [Cumulus Lite Line 400](/p/cumulus-lite-line-400.md) Thanks for the test and review go to: **Michal Sedláček** - [Cumulus Lite Line 200](/p/cumulus-lite-line-200.md) - [Cumulus Lite Line 300](/p/cumulus-lite-line-300.md) - [Cumulus Lite Line 400](/p/cumulus-lite-line-400.md) - [Cumulus Panyam 450](/p/cumulus-panyam-450.md) - [Cumulus Panyam 600](/p/cumulus-panyam-600.md) - [Cumulus Teneqa 700](/p/cumulus-teneqa-700.md) - [Cumulus Teneqa 850](/p/cumulus-teneqa-850.md) - [Cumulus Alaska 900](/p/cumulus-alaska-900.md) - [Cumulus Mysterious Traveller 500](/p/cumulus-mysterious-traveller-500.md) - [Cumulus Mysterious Traveller 700](/p/cumulus-mysterious-traveller-700.md) This post is also available as [HTML](/blog/review-cumulus-lite-line-400-patagonia). ## Sitemap See the full [sitemap](/sitemap.md) for all pages.