At my home, I use plastic bags as liners for my trashcans and recycling bins. Each week, my roommates and I use close to ten different plastic bags to hold our waste and recyclables. The scary thing about this is that plastic shopping bags that we re-use as trash liners never really decompose.
“The most common type of plastic shopping bag is made of polyethylene, a petroleum-derived polymer that microorganisms don’t recognize as food and as such cannot technically biodegrade.”-IndyWeek.com
My plastic bags now go directly into the recycling bin.
BioBag USA makes corn-based biodegradable trashcan liners in many different sizes. The liners will decompose in open-air landfills at a rate similar to the waste products surrounding the liner. You can find these at your neighborhood Whole Foods for just a bit more than regular trash can liners.