I have a Kellerabteil (cellar area) where like everyone else I dump the rubbish that I don't have the heart to throw away. I had a rucksack down there and it's now covered in mould, possibly because it was lying on the floor. I put a thermometer down there to measure the temperature and relative humidity, and found that the Relative Humidity ranges between 68 and 74%, compared to around 58% in my living room. The temperature is around 18.5°C.
What is the practical outcome of this high humidity? Is it a bad idea to store bags, blankets and the like down there? I notice that my neighbours do store bags and whatnot down there. What are your experiences with damp cellars?