Hi I'm buying a rear Bagger for my new about to buy JD D125 & want to know if I can just put in a plastic garbage in the Bagger so I don't have to put the grass in by hand into the bag.
Material collections which use a hard plastic container are designed with a path for the air to escape. Bagging systems depend on the air to exit through the woven bag. That is why Rivets said "they don't often work".
Most mower shops and all produce store keep woven gaysheen grass bags.
These will be the best you will be able to do but even then they won't flow air any where near as well as the interlock woven bag.
The question is why do you want to put the grass into a plastic bag ?