In reply to joeramsay:
Just my thoughts, but seems pretty big when compressed, and slightly heavy. If you are taking a summer down jacket/softshell you could go for a smaller/ligher but probably higher sleep limit bag, and just wear the jacket/other clothing in the bag? I have endured summer storms in the alps with a 4-5 deg sleep comfort bag (-1 limit i think), with bivi bag, shelter, foam roll mat and been perfectly happy.
You want to be minimalistic and light as much as possible, as hauling stuff up mountains can get uber tiring.
Also I don't have this sleeping bag, so only judging from what I've read on their page. although do have an old appkit sleeping bag and the quality is really good. Love appkit, nearly everything they produce does the job for the price!
Post edited at 11:37