Yes, it does depend on the baler. I've never seen one that goes as low as 40 lbs, but then I'm from the dryland west (Eastern Washington) and most balers there seem to run to the >100 lb range. My own limited experience has been with balers that run around 100-125 lbs, but asthma disqualified me from working at haying years ago and my knowledge of more recent balers derives entirely from conversations with fellow Grange members --- mostly either cattle farmers or hay growers.