I have something like this for leaf bagging and this post made me think that it might be helpful in my 31-gal trash can separator ala the Lumberjocks link.
amazon.com/Easy-Bagger-Plastic-Trash-Liner/dp/B0000BYCMO/ref=sr_1_24?ie=UTF8&qid=1394316511&sr=8-24&keywords=Lawn+Bag+hold+open
amazon.com/Easy-Bagger-Plastic-Trash-Liner/dp/B0000BYCMO/ref=sr_1_24?ie=UTF8&qid=1394316511&sr=8-24&keywords=Lawn+Bag+hold+open