# Meal Prep Containers: Glass vs Plastic vs Steel, Sizes and Safety

> Choose meal prep containers with confidence: glass vs polypropylene vs stainless steel, BPA facts, microwave and freezer safety, and the sizes you really need.

Canonical URL: https://weeklymealprep.food/blog/meal-prep-containers

Published: 2026-10-18 | Updated: 2026-10-19 | Author: J&H Technology LLC (MealPrepPro team)

**Key takeaway:** Most home meal preppers do best with a mix: glass containers for reheating and fridge storage, polypropylene (#5) plastic for lightweight lunches and freezing, and stainless steel for cold foods and travel. Choose containers labeled for the use you need (microwave-safe, freezer-safe, dishwasher-safe), size them to your real portions, and replace any that are cracked, warped or stained.

The best meal prep containers are the ones that match how you store and reheat food. For most people that means glass for meals you microwave at home or at work, polypropylene plastic for lightweight lunches and freezer portions, and stainless steel for salads, snacks and anything you eat cold. Buy a few standard sizes rather than a drawer of mismatched lids, and always follow the microwave-safe and freezer-safe markings on each piece.

This guide is brand-neutral. It covers materials, BPA, microwave and freezer safety, sizes, and how many containers you need.

## What are the main types of meal prep containers?

Three materials cover almost every home meal prep need. Each has a clear set of strengths.

| Feature | Borosilicate or tempered glass | Polypropylene plastic (#5) | Stainless steel |
|---|---|---|---|
| Weight | Heavy | Light | Light to medium |
| Microwave | Yes (base), check lid | Only if labeled microwave-safe | No |
| Oven | Often yes (base only), check rating | No | Some, check rating; never in microwave |
| Freezer | Yes, if labeled; leave headspace | Yes, if labeled | Yes |
| Staining and odors | Resists both | Stains with tomato, turmeric, curry | Resists both |
| Breakage | Can chip or shatter | Can crack or warp | Can dent |
| See contents | Yes | Usually (clear) | No |
| Typical lifespan | Many years if not chipped | Shorter; replace when worn | Many years |
| Best for | Reheating, fridge storage, home use | Portable lunches, freezer batches, kids | Cold lunches, snacks, travel |

### Glass containers

Glass is the workhorse for anyone who reheats meals. It does not absorb tomato sauce stains or curry smells, it lets you see what is inside, and many glass bases can go from fridge to microwave to oven. The tradeoffs are weight and breakage.

Two types are common: borosilicate glass, which is more resistant to sudden temperature changes, and tempered soda-lime glass, which is tougher against impact. Either way, avoid extreme temperature jumps, such as moving a container straight from the freezer into a hot oven or pouring boiling liquid into a cold container. Let frozen glass thaw in the fridge first, or check the manufacturer's instructions for oven use from cold.

Most glass containers have plastic lids. The lid is usually the weak point: many are not meant for the microwave or oven, so vent or remove them as directed.

### Polypropylene plastic containers

Polypropylene, marked with resin code 5 inside the recycling triangle, is the most common plastic used for reusable food containers. It is light, cheap, hard to break and generally handles freezing well. Look for containers specifically labeled microwave-safe if you plan to reheat in them.

Downsides: plastic stains easily (especially with tomato sauce, turmeric and chili oil), can hold odors, and wears out. Scratches, cloudiness, warping and cracks are signs to replace a container. Thin single-use takeout tubs are generally not designed for repeated microwave use; reuse them for dry goods or cold storage instead.

### Stainless steel containers

Stainless steel is durable, light, doesn't stain and is easy to clean. It is a great choice for salads, cut fruit, overnight oats, snacks, and anything you eat cold or at room temperature. Steel works in the freezer too.

The big limitation: never put metal in the microwave. If you reheat at work, steel means transferring food to a plate first. You also cannot see what is inside, so labeling matters more.

### Other options worth knowing

- **Silicone bags and containers** work for freezing soups and marinating; check heat ratings.
- **Mason-style glass jars** are good for soups, salads in layers, and overnight oats. Leave headspace if freezing, and use jars sold as freezer-safe.
- **Bento-style divided containers** keep wet and crisp foods apart, which helps salads and crackers stay fresh.

## Are plastic meal prep containers safe? What about BPA?

BPA (bisphenol A) is a chemical used in some polycarbonate plastics and in epoxy coatings in some cans. The FDA's current position is that "BPA is safe at the current levels occurring in foods," based on its ongoing review ([FDA: Bisphenol A (BPA): Use in Food Contact Application](https://www.fda.gov/food/food-packaging-other-substances-come-contact-food-information-consumers/bisphenol-bpa-use-food-contact-application)). The FDA no longer allows BPA-based polycarbonate in baby bottles and sippy cups (2012) or BPA-based epoxy coatings in infant formula packaging (2013); the agency notes those changes were made because industry had abandoned those uses, not on safety grounds.

Polypropylene is not made with BPA, which is why most reusable food containers sold today are labeled BPA-free. If you want to limit exposure to any chemicals migrating from plastics, some simple habits help regardless of the science debate:

1. Reheat in glass or ceramic when you can, especially fatty or acidic foods.
2. Only microwave plastic that is labeled microwave-safe, and follow its directions.
3. Do not microwave plastic lids or plastic wrap unless they are labeled for it, and keep wrap from touching food.
4. Replace plastic containers that are cracked, warped, deeply scratched or cloudy.
5. Hand-wash or use the top rack of the dishwasher if the maker recommends it.

The FDA has a consumer page on [food packaging and other substances that come in contact with food](https://www.fda.gov/food/food-ingredients-packaging/food-packaging-other-substances-come-contact-food-information-consumers) if you want to read more.

## How do you safely microwave and freeze prepped meals?

Container choice only goes so far. Storage temperatures and timing are what keep prepped food safe.

| Rule | Guidance | Source |
|---|---|---|
| Fridge temperature | At or below 40 F (4 C) | [FoodSafety.gov](https://www.foodsafety.gov/food-safety-charts/cold-food-storage-charts) |
| Freezer temperature | 0 F (-18 C) | FoodSafety.gov |
| Cool and refrigerate | Within 2 hours of cooking (1 hour if above 90 F) | [USDA FSIS](https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/leftovers-and-food-safety) |
| Cooked leftovers in the fridge | 3-4 days | USDA FSIS |
| Frozen leftovers | Safe indefinitely at 0 F; best quality within about 2-6 months | USDA FSIS |
| Reheating | To 165 F (74 C) | USDA FSIS |

### Microwave tips for prepped meals

1. Use a container labeled microwave-safe; vent or remove the lid as directed.
2. Spread food in an even layer and leave a small well in the center of dense foods like rice or casseroles.
3. Add a splash of water to rice, pasta or grains before reheating.
4. Heat in stages, stirring halfway, because microwaves heat unevenly.
5. Check that the food reaches 165 F with a thermometer, especially poultry and casseroles.

### Freezer tips

1. Cool food in shallow containers before freezing so it chills quickly; very deep containers cool slowly.
2. Leave about 1/2 to 1 inch of headspace for soups, stews and sauces, which expand as they freeze.
3. Press plastic wrap or parchment onto the surface of food, or squeeze air out of bags, to reduce freezer burn.
4. Label with the contents and date.
5. Thaw in the fridge overnight rather than on the counter.

For more detail on freezer workflows, see our [freezer meal prep guide](/blog/freezer-meal-prep), and for storage times by food, see [how long meal prep lasts in the fridge](/blog/how-long-does-meal-prep-last-in-the-fridge).

## What size meal prep containers do you need?

Sizes vary by brand, so think in cups and use the list below as a starting point. Measure a typical portion of your own meals into a measuring cup to confirm.

| Size | Approx. volume | Good for |
|---|---|---|
| Small | 1/2 to 1 cup (4-8 oz) | Sauces, dressings, nuts, hummus, cut fruit |
| Medium | 2 to 3 cups (16-24 oz) | Breakfasts, side dishes, soup portions, snacks |
| Large | 3 to 4 cups (24-32 oz) | Full lunches and dinners, grain bowls, salads |
| Two- or three-compartment | 3 to 4 cups total | Protein, starch and vegetables kept separate |
| Family size | 6 to 12 cups | Bulk batches of grains, chili, soups |

A typical single-serving dinner (about 4-6 oz cooked protein, 1 cup grains or starch, 1-2 cups vegetables) fits in a 3-4 cup container. A big salad needs more volume than its calories suggest; use 4 cups or more and pack dressing separately.

### Square, rectangular or round?

Square and rectangular containers use fridge and freezer space more efficiently and stack neatly. Round containers are easier to clean in the corners and often heat a bit more evenly. Most people do fine with rectangular containers for meals plus a few round ones for soups.

## How many meal prep containers do you need?

Use this simple formula:

1. Count the meals and snacks you prep in a typical week. Example: 5 lunches + 3 breakfasts + 5 snacks = 13 portions.
2. Add 25% so you have spares while some are in the dishwasher: 13 x 1.25 = about 16.
3. Split by size: 8 large (meals), 4 medium (breakfasts), 4 small (snacks and dressings).
4. Add a few freezer containers or bags if you batch cook soups or sauces.

For a household of two prepping lunches only, 10-12 large containers plus a handful of small ones is usually enough. For [family meal planning](/blog/family-meal-planning), add family-size containers for bulk components like rice, shredded chicken and roasted vegetables.

## How to keep containers in good shape

1. **Remove stains** on plastic with a paste of baking soda and water, or leave the container in sunlight for a few hours.
2. **Fight odors** by washing promptly and drying with lids off.
3. **Check seals** regularly; replace gaskets or lids that no longer close tightly, since a loose lid speeds up drying and freezer burn.
4. **Avoid sharp tools** in plastic containers, which scratch surfaces and hold residue.
5. **Retire damaged pieces.** Chipped glass, cracked plastic and warped lids should go.

## Container checklist before you buy

- Is each piece labeled microwave-safe, freezer-safe and dishwasher-safe for how you plan to use it?
- Are the lids rated separately from the bases?
- Do the sizes match your actual portions?
- Do they stack and nest to save space?
- Can you buy replacement lids?
- Is the lid leak-resistant if you carry soups or dressings?

## How MealPrepPro helps you plan what goes in the containers

MealPrepPro is an iOS app with 1,000+ built-in recipes, each listing calories, protein, carbs and fat per serving, which makes portioning into containers easier. Its weekly planner has breakfast, lunch, dinner and snack slots, and the Premium meal plan generator can plan leftover dinners and lunches so you know how many containers to fill. The app can also send weekly meal-prep-day reminders and expiration alerts. See [features](/features).

## Frequently asked questions

### Is glass or plastic better for meal prep?

Glass is better for reheating, resists stains and lasts years if it does not chip. Polypropylene plastic is lighter, cheaper and harder to break, which suits carried lunches and freezer batches. Many people use glass at home and plastic for transport.

### Can you put glass meal prep containers in the freezer?

Yes, if they are labeled freezer-safe. Leave headspace for liquids, cool food before freezing, and avoid moving frozen glass straight into a hot oven; thaw it in the fridge first unless the maker says otherwise.

### Are BPA-free containers safe to microwave?

BPA-free does not automatically mean microwave-safe. Only microwave containers labeled microwave-safe, follow the directions for the lid, and replace plastic that is warped, cracked or cloudy. Reheating in glass or ceramic is a simple alternative.

### How long does food last in meal prep containers?

The container does not change the clock: cooked leftovers keep 3-4 days in a fridge at or below 40 F, according to USDA FSIS. Freeze portions you will not eat within that window.