I had one of their modular sleeping bag systems but didn't rate it. It was massively bulky and the big bag wasn't particularly good quality. The best things about it were that it all attaches together with button presses, lining the zips up. The summer weight bag wasn't too bad though. The best I had was a high peak xtreme pak (supposed to be rated to - 18), I have used it in the snow a bit but by adding a thermalite reactor liner makes it ideal for just about any temperature
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