For most people, the best meal prep containers are glass with snap-lock lids: they reheat well, don't stain, and the glass base can often go in the oven (the lids usually can't). If you carry lunch every day, add a few lightweight plastic containers labeled microwave-safe. One person prepping lunch and dinner for five days needs about 10 main containers of 24-32 oz (3-4 cups).
This guide compares the four materials, explains what the FDA says about plastic and BPA, and covers sizes, how many to buy, freezing and how long food lasts inside them.
Key takeaways
- Glass for home, plastic for travel: glass reheats and lasts better; plastic is lighter and won't shatter in a bag.
- "BPA-free" doesn't mean microwave-safe. Look for the microwave-safe label on any plastic you heat.
- 24-32 oz (3-4 cups) fits a typical 400-600 calorie meal.
- Leave headspace when freezing: 1/2 inch in a wide-mouth pint, 1 inch in a quart for liquids.
- 3-4 days is the fridge limit for most cooked meals, whatever container you use.
Glass vs plastic vs stainless steel vs silicone
| Material | Microwave | Oven | Freezer | Weight | Stains and smells | Best for |
|---|---|---|---|---|---|---|
| Glass (tempered or borosilicate) | Yes | Base often yes, lids usually no | If rated for it | Heavy | Resists both | Home prep, reheating, 3-4 day storage |
| Plastic | Only if labeled microwave-safe | No | Usually | Light | Can stain and hold smells | Commuting, gym bags, kids |
| Stainless steel | No | Some, check the maker | Yes | Medium | Resists both | Cold lunches, salads, travel |
| Silicone | Usually | Some, check the maker | Usually | Light | Can hold smells | Snacks, sauces, collapsible storage |
Behind the table:
- Glass is the one material that handles fridge, microwave and (usually) oven in the same container, which is why most meal preppers end up with it. It's heavier and costs more, and it can break if dropped. A cloth sleeve or insulated bag helps if you carry it.
- Plastic is cheap and light, but tomato sauce and curry can stain it, and scratched or warped pieces seal less well over time. It can't go in the oven.
- Stainless steel can't go in the microwave. The FDA notes metal reflects microwaves and can damage the oven, so steel works best for meals you eat cold or transfer to a plate.
- Silicone folds flat, which saves cabinet space. It's most useful for small portions.
Brands that come up often in reviews include Pyrex and Glasslock for glass and Rubbermaid for plastic. Whatever you buy, check the label for microwave, dishwasher and freezer ratings on both the container and the lid.
Are plastic meal prep containers safe?
Two separate questions get mixed up here.
BPA. The FDA's current position, based on its most recent safety assessment, is that BPA is safe at the levels currently found in foods. The FDA did amend its rules so BPA-based plastics are no longer used in baby bottles, sippy cups and infant formula packaging, because manufacturers had stopped using them.
Heat. This is the more practical concern. The FDA says some plastic containers shouldn't go in the microwave because they can melt from the heat of the food inside. Only heat plastic labeled microwave-safe, and replace containers that are warped, cracked or deeply scratched. If you'd rather not heat plastic at all, reheat in glass or on a plate.
What size meal prep containers you need
Container sizes are usually listed in fluid ounces. 8 fl oz equals 1 cup.
| Size (fl oz) | Volume (cups) | Volume (ml) | Good for |
|---|---|---|---|
| 2-4 | 1/4-1/2 | 60-120 | Dressings, sauces, nut butter |
| 8 | 1 | 240 | Greek yogurt, cottage cheese, cut fruit |
| 16 | 2 | 470 | Snacks, sides, a bowl of soup |
| 24-28 | 3-3.5 | 710-830 | A meal of protein, carb and vegetables, packed snugly |
| 32-34 | 4-4.25 | 950-1,000 | The same meal with room to keep the parts apart |
| 38-42 | 4.75-5.25 | 1,120-1,240 | Large or high-calorie meals |
| 64 | 8 | 1,890 | Batch-cooked protein, grains or soup |
For scale: 5 oz (142 g) of chopped cooked chicken breast, 1/2 cup of brown rice and 1 cup of broccoli, cooked with 1/2 tbsp of oil, is about 2.5 cups of food and 473 calories. It fits a 24-28 oz container with room to close the lid; a 32 oz container gives space to keep the parts apart.
If two people in your house eat very different amounts, use two sizes and label them. Our guide to meal prep for couples with different calorie targets shows how.
How many meal prep containers you need
Count the meals, then add small ones:
- Lunches only, 5 days: 5 main containers.
- Lunch and dinner, 5 days: 10 main containers.
- Prepping twice a week (Sunday and Wednesday): 6-8 main containers, because you wash and refill midweek.
- Breakfasts: 4-5 wide-mouth pint or quart jars for oats or parfaits.
- Snacks and sauces: 6-10 small 2-8 oz containers.
Running out of clean containers midweek is an easy way to stall a routine, so buy a set a little larger than your count. For a full week of breakfast ideas that fit jars, see meal prep breakfast ideas, and for snack-sized portions, meal prep snacks.
Features worth paying for
- Locking lids with a gasket. They seal better than press-on lids. Take the gasket out to wash it now and then, since food can collect under the rim.
- Vented lids. Let steam escape when you microwave, so less splatter.
- Compartments. Two or three sections keep sauce off the rice and crisp food away from wet food. The divider needs to seal against the lid to do this.
- Square or rectangular shapes. They stack and use fridge space better than round ones.
- Freezer rating. Not every container that's fine in the fridge handles freezing. Check before you batch-freeze.
- Lids you can replace. Lids wear out before glass bases do. Buying from a brand that sells lids separately saves replacing the whole set.
Freezing meal prep in containers
Food expands as it freezes, so leave room at the top. The National Center for Home Food Preservation gives these headspace amounts. Its table is written for fruit and vegetables, and the liquid-pack row works as a guide for soups and stews:
| What you're freezing | Wide-top pint | Wide-top quart | Narrow-top pint | Narrow-top quart |
|---|---|---|---|---|
| Liquid pack (fruit in juice or syrup; soups and stews) | 1/2 inch | 1 inch | 3/4 inch | 1 1/2 inches |
| Dry pack (food with no added liquid) | 1/2 inch | 1/2 inch | 1/2 inch | 1/2 inch |
Regular glass jars break easily at freezer temperatures. If you freeze in jars, choose wide-mouth jars made for both freezing and canning, and pick straight-sided containers, which make frozen food easier to get out.
Let hot food cool before it goes in the freezer, and don't move glass straight from the freezer to a hot oven. Thaw it in the fridge first. For a full system, see freezer meal prep: cook once a month.
How long food lasts in meal prep containers
A good seal keeps food from drying out, but it doesn't extend safe storage time. For a fridge at 40°F (4°C) or below, the FoodSafety.gov chart gives:
| Food | Fridge | Freezer (quality) |
|---|---|---|
| Cooked meat or poultry | 3-4 days | 2-6 months |
| Soups and stews | 3-4 days | 2-3 months |
| Egg, chicken or tuna salad | 3-4 days | Does not freeze well |
| Casseroles with eggs | 3-4 days | 2-3 months |
| Hard-cooked eggs | 1 week | Do not freeze |
Refrigerate cooked food within 2 hours, per the CDC. Freezer times are for quality; food held at 0°F (-18°C) stays safe indefinitely, according to the FDA. Because of the 3-4 day limit, many people prep twice a week instead of once. If cost matters, healthy meal prep under $50 pairs well with a reusable container set.
Care and cleaning
Pyrex's safety instructions come down to avoiding sudden temperature changes, and they're a good rule for most glass storage:
- Don't pour cold liquid into hot glass or set hot glass on a wet or cold surface.
- Preheat the oven before the glass goes in. Never use glass storage on a stovetop, under a broiler, on a grill or in a toaster oven.
- Keep plastic lids out of conventional and convection ovens.
Replace any glass that's chipped or cracked. Pyrex lists its glass and lids as dishwasher-safe; for other brands, check the label, since some plastic lids are top-rack only. A soak in warm water with baking soda helps with smells in plastic.
Once your meals are in containers, logging them is the easy part. Log a prepped meal once, save it, and the rest of the week is one tap. Nutrify, the app we make, can log from a photo, a barcode or a spoken description, and has a 7-day free trial, then a paid subscription.
Sources
- U.S. Food and Drug Administration, Bisphenol A (BPA): Use in Food Contact Application.
- U.S. Food and Drug Administration, Microwave Oven Radiation.
- National Center for Home Food Preservation, Headspace to Allow and Containers for Freezing.
- Pyrex, Product Warranties and Safety and Usage.
- FoodSafety.gov, Cold Food Storage Chart.
- U.S. Food and Drug Administration, Refrigerator and Freezer Storage Chart.
- Centers for Disease Control and Prevention, Four steps to food safety.
- Cook Smarts, Review: Which Meal Prep Containers to Use and Why.
- USDA FoodData Central: chicken breast, roasted 171477; brown rice, cooked 169704; broccoli, boiled 169967; olive oil 171413 (example meal).
