Lafuma Extreme 800 LD
3.5 only because of price, which is exceptional, but…
Price Paid: $57
3.5 only because of price, which is exceptional, but at 160cm / nearly 5"4 i only just fit inside, and at 9Celcius I had to put on a shirt and hoodie to be warm inside a tiny tent with rain fly on.
I do sleep cold but the for weight and warmth I am only so-so impressed, though I do very much like the water resistant outer that also works excellent as a windblock - a huge problem in my previous LaFuma and other sleep bags.
For the price it's great as a summer bag, to maybe 15C, however if you sleep warm enough and for summer only you'd be probably better off with the lighter weight ones, or if you need a bit of warmth for those cooler summer nights / mountains then get a warmer bag.