This study was prepared under contract from the Department of Resources Recycling and Recovery (CalRecycle). The study's results will provide CalRecycle with statewide and regional Co-Mingled Recycling Rates for the purpose of estimating the weight of plastic carryout bags recycled by stores with At-Store Recycling Programs, and will provide CalRecycle with data for developing methods and processes for determining more accurate Co-Mingled Recycling Rates to use to calculate an annual plastic carryout bag recycling rate.