Plastic food storage containers — food safety profile

What is this product?

Reusable plastic containers used to store, refrigerate, freeze, and often reheat food. The plastic type is the critical variable: polypropylene (PP, resin code #5) and high-density polyethylene (HDPE, #2) are generally the lowest-concern options; polycarbonate (#7, BPA-based) was the historic standard but is now largely phased out for food use. The hazard profile varies dramatically by resin type, temperature of use, and food type.

What's in it

Click any compound name for its full safety profile, regulatory consensus, and exposure data.

Who's most at risk

• Pregnant Women — Fetal exposure via placental transfer; developing endocrine systems of fetus
• Children — Higher food-to-body-weight ratio, developing organ systems

How to use it more safely

• Use only with food items at or below room temperature
• Ensure containers are BPA-free and food-grade certified
• Hand wash with mild soap; avoid abrasive scrubbing
• Keep away from direct sunlight and heat sources

Red flags — when to walk away

• Resin code #7 on the bottom without 'BPA-free' marking — Resin code #7 ('other') historically included polycarbonate. Legacy #7 containers without explicit BPA-free labeling are likely polycarbonate.
• Cloudiness, crazing, or scratching inside the container — Physical degradation of the polymer surface, indicating increased leaching potential and surface area for migration.
• Microwaving fatty food in any non-PP, non-glass container — Heat + fat dramatically increases migration of plasticizers, BPA, and other additives from polymer to food.
• 'BPA-free' containers made from resin code #7 — Some 'BPA-free' #7 containers substitute BPS or BPF. These alternatives may have comparable estrogenic activity.

Green flags — what to look for

• Resin code #5 (PP) or #2 (HDPE) on the bottom — Lower-concern plastics for food contact; no BPA; minimal plasticizers in typical food-grade formulations.
• Glass container with silicone or PP lid — Inert food-contact surface; no migration from container body.

Safer alternatives

• Glass storage containers — Non-toxic, microwave-safe, does not leach chemicals into food
• Stainless steel containers — Durable, non-reactive, maintains food integrity and temperature
• Ceramic containers with glass lids — Food-safe, inert material, suitable for heating and long-term storage

Frequently asked questions