Ever Wondered What Those Symbols on Your Tupperware Actually Mean?

You’ve probably seen them a hundred times.

Flip over a plastic container, and there they are—tiny triangles, numbers, little cups, forks, snowflakes, microwave icons… and most people just ignore them.

But those symbols actually tell you something important about how safe (or unsafe) your container is for different uses.

And once you understand them, you stop guessing and start using your containers the right way.

Let’s break it down.

1. The Recycling Triangle (The Number Inside Matters Most)

That little triangle made of arrows is the recycling symbol. Inside it, there’s usually a number from 1 to 7.

That number tells you what type of plastic the container is made from.

The most common ones:

#1 – PET or PETE

Used for: disposable bottles, some food containers
Safe for single use
Not meant for repeated heating

#2 – HDPE

Strong, durable plastic
Often used for milk jugs and detergent bottles
Generally considered food-safe and stable

#4 – LDPE

Flexible plastic (like squeeze bottles or wraps)
Low chemical risk
Not typically used for rigid containers

#5 – PP (Polypropylene) ← very important

Common in reusable food containers (including many Tupperware items)
Heat resistant
Microwave-safe in many cases

👉 If your container is reusable and microwave-friendly, it’s often #5.

#6 – PS (Polystyrene)

Think foam containers or disposable trays
Not great for heat or reuse

#7 – “Other”

Mixed plastics or specialty materials
Safety varies—this is the “check carefully” category

2. The Fork and Cup Symbol (Food Safe)

If you see a fork and glass icon, that’s actually a good sign.

It means:

The plastic is food-safe
It’s approved for contact with food

No symbol = no guarantee it’s meant for food storage.

3. Microwave-Safe Symbol

This usually looks like:

A microwave icon
Or wavy heat lines

If you see it:

The container is designed to handle microwave heat
Still, it may have limits (like no high-fat foods or no long heating)

If it’s missing:

Don’t assume it’s safe—heat can warp plastic or release chemicals

4. Dishwasher-Safe Symbol

Often shown as:

Plates with water droplets
Or a dishwasher icon

Meaning:

It can withstand dishwasher temperatures
Usually safe on the top rack

Without it:

Hand washing is safer for the container’s lifespan

5. Freezer-Safe Symbol

Looks like:

A snowflake ❄️

Meaning:

The plastic won’t crack or become brittle in freezing temperatures
Good for meal prep and long storage

6. The Little “Plastic Cup with Number” on Tupperware

On many Tupperware products, you’ll often see:

A number (like 5 or 7)
Sometimes combined with small icons

This is basically the manufacturer telling you:

“Here’s what this container can safely handle.”

But here’s the catch:
Even if a container is durable, heat + fat + time can still affect plastic over the long run.

7. What Most People Get Wrong

A few common mistakes:

❌ “If it’s plastic, it’s all the same”

Not true—plastic types behave very differently.

❌ “Microwave-safe means unlimited heating”

Nope. It usually means limited, controlled heating.

❌ “Old containers are still fine forever”

Plastic degrades over time, especially with scratches or cloudiness.

Bottom Line

Those tiny symbols aren’t decoration—they’re instructions.

Once you understand them, you can:

Heat food more safely
Store leftovers smarter
Avoid using the wrong container for the wrong job

So next time you flip over a container, you won’t ignore those markings—you’ll actually know what they’re trying to tell you.

If you want, I can also make this into:

a super simple “cheat sheet” image-style guide
a viral TikTok script
or a breakdown of “which plastics to avoid completely”