WinCo Foods, Inc. is a privately held, majority employee-owned American supermarket chain based in Boise, Idaho, with retail stores in Arizona, California, Idaho, Montana, Nevada, Oklahoma, Oregon, Texas, Utah, and Washington. It was founded in 1967 as a no-frills warehouse-style store with low prices. The stores feature extensive bulk food sections.

Bulk foods are food items offered in large quantities, which can be purchased in large, bulk lots or transferred from a bulk container into a smaller container for purchase. Bulk foods may be priced less compared to packaged foods because they are typically packaged in large generic bulk containers and packaging for grocery outlets, which utilizes lesser natural resources. Additionally, less packaging is congruent with the environmental conservation of natural resources and sustainability. One study found a 96% reduction in packaging used for bulk foods compared to packaged foods.