https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/4024978
Haymaking
For overall economy, the round bale rules and weigh 750-1500lbs The machines that make them are the simplest to operate and toughest to break.
They can either use twine or plastic netting to hold them together. The netting is expensive but some states require it when hauling on highways to prevent hay from blowing. Original public domain image from Flickr
Public DomainFree CC0 image for Personal and Business use