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the only really important thing in a sleeping bag is the fill power of down, for a given weight.
the higher number, the warmer it will be.the decathlon is 800 fill
alpkit is 750
seatosummit is a pathetic 600generally no point buying anything less than 800 fill. so get the decathlon one unless you want to pay less, in which case borrow from friends, or buy a second hand 800+ fill bag
I'm in a similar position. I've been looking at the alpkit pipedream 400 and the seatosummit treeline t11. Are they any better quality than the decathlon? I was about to make the plunge on the alpkit until I read the reviews and a few people said it is not as warm as they claim.
The decathlon looks to have the most feathers but not the lowest temperature rating. Are they just bullshitting less.