Does anyone have any experience with the Mammut Sphere Down 3-Season sleeping bag? I think it's a discontinued product.
I'm looking for a lightweight 3-season down sleeping bag for a September trip to the Alps. I've found someone selling one, and on paper it seems to fit the bill (850g, 500g of 800FP down, small pack size) but I'm struggling to find many reviews about it online.
The best alternative I've seen is the Alpkit Pipedream 400, which is slightly heavier but slightly warmer (and I'm struggling to find any for sale anyway), or the Sea to Summit Spark SpIII, which is much more expensive.