How to Choose Meal-Prep Containers and Portion Tools

Meal prep means cooking in batches, dividing the food into portions and storing it so you can eat it across several days. The containers and tools you pick affect whether the food stays safe, whether it reheats evenly and whether a portion matches what you meant to eat. This guide sets out what to check before you buy, for adults who cook for themselves or a household. If you are pregnant, are 65 or older, cook for a child under 5 or have a weakened immune system, read the note near the end first.

The criteria come from named public sources: the USDA Food Safety and Inspection Service (FSIS), the Centers for Disease Control and Prevention (CDC), FoodSafety.gov, the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and the makers' own care instructions. We do not rank products or rate brands. Amazon links on this page open searches built from the criteria, and you check each listing against what the maker says.

Start with how long the food will be kept

FSIS says leftovers can be kept in the refrigerator for 3 to 4 days or frozen for 3 to 4 months, and CDC advises refrigerating cooked leftovers within 2 hours, or within 1 hour if the food has been exposed to temperatures above 90°F. That sets the shape of a meal-prep kit: containers for the next three or four days that go in the fridge, and containers for everything else that go in the freezer. Our guide to batch cooking and food safety covers cooling, storing and reheating.

Check the fridge before you buy a stack of tubs. CDC says to keep the refrigerator at 40°F or below and the freezer at 0°F or below. Here is a search for a refrigerator and freezer thermometer on Amazon (opens in a new tab).

Glass, plastic and the lid

Glass is heavier. Plastic is lighter, which matters if you carry food to work, but makers differ on staining: the glass example below is described as resisting stains and odors, while the plastic example's specification sheet lists it as not stain resistant. Searches for glass meal-prep containers on Amazon (opens in a new tab) and plastic meal-prep containers on Amazon (opens in a new tab) show both kinds.

The lid is usually where the limits sit. The glass maker says its lid is a separate BPA-free plastic part that is top-rack dishwasher, freezer and microwave safe. Read the instructions for the base and the lid separately. "BPA-free" is each maker's own statement about its product.

Look for a microwave label, and do not reuse takeout tubs

FSIS says to use only cookware made for the microwave oven, and notes that glass, ceramic and plastic containers that are safe for it are usually labeled for microwave use. Its list of things that are not safe includes cold-storage containers such as margarine tubs and cottage cheese or yogurt cartons, because those materials are not approved for cooking and chemicals can migrate into food. A container with no microwave statement and no care instructions is, in our view, a reason to look elsewhere.

Read the care instructions, not just the front of the pack

Look for an explicit statement on each of these, for the base and the lid:

• Refrigerator and freezer. Needed for any container you plan to freeze. Both examples below say their containers are freezer safe.
• Microwave. Check whether the lid can go in the microwave and whether it must be vented. FSIS advises venting the lid or wrap to let steam escape.
• Oven, stovetop and broiler. Neither example's product page states an oven rating, so do not assume one. Pyrex's separate use-and-care page says not to use its glassware on a stovetop, under a broiler or in a toaster oven, air fryer, slow cooker or other countertop cooking appliance, not to move it straight from the freezer to a hot oven, and to avoid sudden temperature changes such as setting hot glass on a wet or cool surface or adding liquid to it.
• Dishwasher. The glass maker says its lid is top-rack only.

Size the container to the portion

Choose the container for one portion, not for the whole batch. FSIS advises dividing large amounts of food into shallow containers so they cool quickly, and CDC says it is fine to put small portions of hot food in the refrigerator because they chill faster. For the freezer, FSIS says a food 2 inches thick should ideally freeze completely in about 2 hours. The 4-cup glass example below is listed by its maker at about 5 by 7 inches and 1.75 inches high. Here is a search for freezer-safe food containers on Amazon (opens in a new tab).

Compartments as a visual guide

Divided containers keep a starch, a protein and vegetables apart, and they make the proportions visible. A divided lid is a convenience, not a nutrition plan: the federal servings guide that accompanies the 2025–2030 Dietary Guidelines gives serving sizes in cups and ounces, and how those fill a compartment depends on the container. Our guide to portion control without counting goes through them.

Portion tools that earn their place

A scale and measuring cups are useful when you portion a batch, because you decide the portion once and then repeat it. NIDDK points out that the serving size on a Nutrition Facts label is not a recommendation of how much you should eat. Michigan State University Extension suggests using measuring utensils at least once a week to check that portions are not creeping up. Two searches to start with: a digital kitchen scale on Amazon (opens in a new tab) and a measuring cup and spoon set on Amazon (opens in a new tab).

A thermometer for the finished dish

FSIS says to reheat leftovers to 165°F as measured with a food thermometer. It also warns that microwave ovens can cook unevenly and leave cold spots, so the temperature should be checked in several places. FSIS says the thermometer's own instructions tell you how far to insert it (it gives about 2 to 3 inches for a dial thermometer), so read them for the one you buy. An instant-read food thermometer on Amazon (opens in a new tab) is the usual starting search.

Taking the food with you

FSIS recommends insulated, soft-sided lunch boxes or bags for keeping food cold, and advises packing at least two ice sources with perishable food. For the bag, the ice packs and the time limits, see packing a lunch that keeps. A search for an insulated lunch bag on Amazon (opens in a new tab) is a start.

Two examples that publish their care instructions

These are examples, not recommendations or a ranking. Each maker publishes the details the criteria need. The descriptions are in our words from those pages, which change, so check the pack you receive.

• Pyrex MealBox 4-cup divided glass food storage container. The maker's page describes a tempered glass dish with a plastic lid and a 4-cup capacity. It says the glass is dishwasher, freezer and microwave safe, and that the BPA-free lid is top-rack dishwasher, freezer and microwave safe. It also lists a two-year limited warranty. Pyrex's use-and-care page also warns against sudden temperature changes and direct heat. Search Amazon for this product (opens in a new tab).
• Rubbermaid TakeAlongs 3.7-cup divided containers. The maker's page describes a plastic container with a divided base and a click-tight lid, and says the bases and lids are BPA-free, microwave safe and dishwasher safe. Its specification sheet also lists the container as freezer safe and not stain resistant. The page lists no oven rating or care warnings, so read the insert in the pack. Search Amazon for this product (opens in a new tab).

Who should take extra care

FoodSafety.gov says anyone can get food poisoning, but adults 65 and older, children under 5, people whose immune systems are weakened by illness or medical treatment and pregnant women are more likely to get sick or to become seriously ill. It asks those groups to follow the four basic steps (clean, separate, cook, chill), including chilling cooked leftovers within 2 hours. Its page on those groups also says to use cooked leftovers within 4 days, so the 3-day end of FSIS's 3 to 4 days is the safer plan. If you manage a medical condition with your diet, ask your doctor or a registered dietitian about portions before you change them.

Where the links go

Links marked "on Amazon" or "Search Amazon" open an Amazon search for the words in the link. Amazon decides what appears, and results can include products that do not meet the criteria above, so check each listing against the maker's care instructions.

Read next

• Batch cooking and food safety: cooling, storing, freezing and reheating.
• Portion control without counting: plates, hands and containers.
• Packing a lunch that keeps: insulated bags and ice packs.

For packaged food, our guide to reading the Nutrition Facts label explains serving sizes.

The care instructions on your containers and the safe-handling label on your food are the authority, ahead of any article, this one included. If you have a health condition or follow a medical diet, ask your doctor or a registered dietitian before you change what or how much you eat.