Take a look at the Kifaru Slick Bag. They are really nice. I own the -20 and +20.
They will be more than $200 used, but worth it. They do come up on Rokslide and Kifaru classifieds but go fast.
Just make sure it has the new insulation if you buy one used.
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I used to buy from them quite a bit but will not anymore. Their communication is terrible and I can find the same deals on many other sites. Not worth the hassle.
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