It also depends on how hard your water is, the harder your water the crunchier they are (I think, or its the other way round

) if you haven't got a tumble dryer you can bash them against something when they are dry.
But IMO you need a tumble dryer if you're going to use bamboo, they just end up too crunchy.
Also if you got them pre-loved you might want to strip wash them, the previous owner may not have and there might be a bit of residue in them making them crunchier