A compostable bag is a type of bag made from natural materials that can break down into organic matter when disposed of in a composting environment. Unlike traditional plastic bags, which can take hundreds of years to decompose, compostable bags are designed to decompose within a few months under the right conditions, contributing to soil health. These bags are often made from materials like corn starch, potato starch, or PLA (polylactic acid), which are derived from renewable resources. When composted properly, they return nutrients to the soil, making them an eco-friendly alternative for carrying items or collecting organic waste.