San Francisco
Compostable Bags
Instructions
Make sure that the bags are labeled "compostable." If labeled "biodegradable", unfortunately, put them in the landfill.
Alternatives
Not using a bag is best. However, you can use a paper bag or newspaper to line your kitchen compost bin if you want a barrier. The soiled paper can then go directly into the compost as well.
Facts
In general, "Biodegradable" waste products have a one year or longer breakdown requirement and are intended for deposit in landfill settings, while compostable waste products have a weekly to monthly breakdown requirement and are intended for deposit in compost facilities.