Pick a container size based on your daily portion and how many days you're prepping
The right container size depends on two things: how much food you eat in one meal, and how many days you're storing it. A 32-ounce container holds about 4 cups and works for most single meals. A 16-ounce container (2 cups) suits lighter lunches or side portions. If you're prepping for five days, you need five containers of that size—or one large container per meal type if you're dividing portions daily.
Start by measuring what you actually eat. Cook a normal lunch portion, put it in a measuring cup, and write down the ounces. Most people eat between 2 and 4 cups per meal. Once you know your portion size, buy containers that match it—not larger, not smaller. Oversized containers waste space in your fridge and freezer. Undersized ones mean food spills or you can't fit everything.
Key Takeaways
- A 32-ounce container holds a typical single meal for most adults; a 16-ounce container works for lighter meals or sides.
- Measure your actual portion size before buying containers so you're not guessing at how much space you need.
- Square or rectangular containers stack better in a fridge or freezer than round ones, saving space.
- Glass containers last longer than plastic but weigh more and take up more room; plastic is lighter and cheaper but may stain or warp over time.
- Buy a few extra containers so you always have clean ones ready while others are in the dishwasher or being used.
Container materials: glass versus plastic
Glass containers are durable and won't absorb stains or odors from spicy or oily foods. They heat evenly in the microwave and oven, and they last for years. The downside is weight—a full glass container is heavy to carry, and glass takes up more cabinet space. Glass also breaks if dropped.
Plastic containers are lightweight, affordable, and come in many sizes. They're straightforward to toss in a lunch bag. Over time, plastic can warp in the dishwasher or microwave, especially if it's thin or low-quality. Colored or oily foods (like curry or salmon) can stain plastic permanently. If you choose plastic, look for containers labeled microwave-safe and dishwasher-safe, and avoid the highest heat settings.
A practical middle ground: buy a mix of both. Use glass for foods you'll reheat at home, and plastic for meals you're carrying to work or school.
Shape matters more than you think
Square and rectangular containers stack neatly in a fridge or freezer, maximizing space. Round containers waste corners and roll around. If you're prepping for a family or storing multiple days' worth of meals, rectangular containers will save you shelf space.
Shallow, wide containers are easier to fill and empty than tall, narrow ones. A container that's 3 inches deep and 6 inches wide is simpler to work with than one that's 5 inches tall and 4 inches wide, even if they hold the same volume. You'll also be able to see what's inside without opening it.
How many containers to buy
Buy at least one more container than the number of meals you're prepping. If you're prepping five lunches, buy six containers. This gives you a clean one ready while others are in the dishwasher, and it accounts for breakage or loss. If you're also prepping dinners or breakfasts, add more.
Many people find that buying a set of 10 to 15 containers works well for weekly meal prep. You'll have enough for the week plus backups. Buying in bulk is usually cheaper per container than buying small packs.
Container size chart for common meals
| Meal Type | Typical Portion Size | Container Size |
|---|---|---|
| Lunch (protein + grain + vegetables) | 3 to 4 cups | 32 ounces |
| Light lunch or side dish | 1.5 to 2 cups | 16 ounces |
| Breakfast (oatmeal, yogurt, eggs) | 1.5 to 2 cups | 16 ounces |
| Dinner (larger portion) | 4 to 5 cups | 40 to 48 ounces |
| Snack or sauce | 0.5 to 1 cup | 8 ounces |
Containers with dividers versus single-compartment
Divided containers let you pack a protein, grain, and vegetable in one box without them touching or mixing flavors. This works well if you like separate components and don't want sauces soaking into everything. The downside is that divided containers are bulkier and harder to clean around the dividers.
Single-compartment containers are simpler to wash and stack. They work best if you're comfortable mixing your meal together or if you're packing items that go well combined—like a grain bowl with sauce already mixed in. Single-compartment containers also give you more flexibility: you can fill them to different levels depending on the day's portion.
Lids and sealing
A tight-sealing lid keeps food fresh longer and prevents leaks in your bag or fridge. Snap-on lids are the most common and work well for most foods. Screw-on lids seal tighter but take longer to open and close. Silicone lids are flexible and reusable but can be harder to clean.
Check that lids fit snugly before you buy. A loose lid defeats the purpose of the container. If you're buying containers without lids, or if lids wear out, replacement lids are usually sold separately and are cheaper than buying new containers.
Frequently Asked Questions
Can I freeze meals in plastic containers?
Yes, but leave a little headroom at the top—about half an inch. Food expands as it freezes, and a completely full container can crack or pop the lid. Plastic is more forgiving than glass when frozen, but very thin plastic may become brittle in the freezer over time.
What size container should I use if I'm meal prepping for a family?
Measure each family member's portion separately. A child's lunch might be 16 ounces while an adult's is 32 ounces. Buy containers in both sizes, or buy all 32-ounce containers and fill some only halfway for smaller portions. Label containers with names so there's no confusion.
Do I need containers with measurements printed on the side?
No, but they're convenient if you're tracking portions or calories. A regular unmarked container works just as well—you only need to measure once when you figure out your portion size. After that, you can eyeball it or use a kitchen scale.
How long do plastic containers last before I need to replace them?
With normal use, a good-quality plastic container lasts one to two years. Cheaper containers may warp or crack sooner. Glass containers last much longer—often five years or more. If a plastic container starts to warp, crack, or discolor heavily, replace it.
Should I buy containers with removable dividers?
Removable dividers give you flexibility—you can use them when you want separate compartments and take them out when you don't. Fixed dividers are sturdier but less versatile. If you're new to meal prep, removable dividers are worth the extra cost.