Supermarket roll bags are generally not toxic.

However, the free rolled plastic bags commonly found in supermarkets are generally pure PE plastic, not food-grade plastic bags. Only food-grade PE plastic bags can be used to hold food. These plastic bags will be clearly printed with special words or patterns such as "food grade", and the SC number and manufacturer will also be noted. Since rolled plastic bags are not very heat-resistant and easily become brittle at low temperatures, they pose certain safety risks.

In general, although supermarket roll bags are not toxic, they are not recommended for holding food for a long time.