Kelty MISTRAL 40

The Kelty Mistral 40 is the lightest and simplest model in the Mistral line — a synthetic mummy bag with CloudLoft insulation rated by the manufacturer to a 4°C limit, aimed at summer nights and lower elevations. Unlike its siblings the Mistral 0 and 20, it skips recycled materials and DWR treatment, and the zipper is one-way only with no draft collar — this is the entry-level, budget option in the range. At 1247 g total with 825 g of fill, its warmth-to-weight ratio of 3.1 is below average for this group, reflecting the simpler sewn-through baffle construction. Shell and liner are both 190T polyester taffeta; a draft tube along the right-side zipper is retained even without the collar, and an internal pocket and stuff sack are included. Internal length is 193 cm, maximum user height 183 cm, packing to 41 x 23 cm. For summer camping and budget-conscious autumn weekend trips, the Mistral 40 is a functional choice — but the lack of DWR treatment is a real limitation on trips with meaningful rain or moisture risk.