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A luthier told me that only hard cases protect the humidity in them, but I have found this not to be entirely true. It helps, definitely. He also told me to humidify in a soft case, to use a few pieces of damp sponge in a couple of baggies with holes, tucked under the strings and around the sound hole. I have tried that with my Baby Taylor, but I rarely play it, so I don’t bother, not wanting to encourage mold. My Zager Parlor lives in a hard case with a humidity monitor, and sometimes when it’s very cold and dry I place a small pan with a little water in it when I take the guitar out to play, and close it up. That works fairly well, but again, the case isn’t completely airtight.