If i buy the Kelty Mistral 0 degree regular size sleeping bag what size compression bag do I need?
JASON G I use a 20 degree Mountain Hardware Pinole bag with the medium Kelty Compression Sack (8x15) and it has another couple inches to stuff. I think a quality, 0 degree bag would fit without any issue. The small, orange sack (6x12) is big enough for a full change of clothes and the large, green(10x18) is plenty big enough for a bag, pillow and more. The material is fairly water resistant but not waterproof on all of them and they pack away very well in the built in pocket. Be careful pulling the compression straps to sharply as they will break off but are easily sewn back if needed, Kelty sacks are great and hold up well. I own a bunch of them.
FRANCIS M Zack,
I would recommend the Extra Large, because that's what I use for my Slumberjack Latitude 0 degree bag. Slumberjack says my bag has a compressed size of 11"x17 - and, with the Extra Large sack, i have a good bit of sack yet to cinch down before I can't compress my bag any further. And, I did a little research for you on Kelty's site. They say that the compressed size of your bag is 12"x24", and given that the Extra Large Compression Sack is 11"x22" - I feel that given a little bit of labor and "stuffing" on your part, that your bag should be able to compress down in the sack further than the 12"x24" dimensions that Kelty specifies. So, yes, definitely - based upon what Kelty says and my own experiences - I say get the Extra Large. You should be able to compress it down tight as a drum and hard as a rock with relative ease.
CHUN YUN C Normally you need a bag with 15 L (size M or larger than that)
and up capacity for a synthetic sleeping bag, 6 L and up for a down bag.