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Ever noticed that little triangle with a number inside at the bottom of your plastic bottles? It’s not just a random symbol—it actually tells you a lot about the type of plastic you’re dealing with, and more importantly, whether that bottle is safe to reuse or not.
In today’s eco-conscious world, especially with the rise of sustainability and zero-waste lifestyles, many people—especially parents and homemakers—are getting creative with repurposing empty bottles after finishing their drinks.
But here’s the thing: not all plastic bottles are safe to reuse. That tiny number at the bottom? It could make all the difference.
Let’s break it down:

#1 – PET (Polyethylene Terephthalate)

You’ll find this on most water and soda bottles. It’s lightweight, clear, and only meant for one-time use. PET starts breaking down at temperatures as low as 158°F (70°C), which means leaving it in the sun or pouring in hot water can release harmful chemicals.
If you must reuse it, only use it for cold water and never for anything hot, acidic (like vinegar), or oily. And even then—don’t keep using it for more than a few days. Bacteria loves this stuff.

#2 – HDPE (High-Density Polyethylene)

This plastic is more durable and can handle higher heat (up to 230°F / 110°C). It’s usually used for things like milk jugs, detergent bottles, or shampoo containers. While technically safe, it’s tough to clean thoroughly, and residue from previous contents could become a breeding ground for bacteria. Best to recycle, not reuse.

#3 – PVC (Polyvinyl Chloride)

PVC is found in products like shower curtains, plumbing pipes, and sometimes cheap plastic packaging—but rarely in beverage bottles. And for good reason: it contains chemicals like phthalates, which can leach into liquids and have been linked to serious health issues like hormonal imbalances and developmental problems.
If you see a “3” on the bottom, steer clear for anything food- or drink-related.

#4 – LDPE (Low-Density Polyethylene)

This plastic is commonly used in things like plastic wrap and grocery bags. While it’s less toxic than PVC, it still isn’t ideal for hot liquids or food. Occasionally you might see it in squeeze bottles, but again, not great for reuse.

#5 – PP (Polypropylene)

Now we’re talking! PP is considered one of the safest plastics out there. It’s heat-resistant (up to 333°F / 167°C), microwave-safe, and often used for things like yogurt containers, baby bottles, and even reusable food containers. It’s also less likely to leach chemicals.
If you see a “5” on the bottom, you’re good to go—just be sure to wash it well between uses.

#6 – PS (Polystyrene)

This one’s tricky. You’ll see it in foam takeout containers and disposable coffee cups. It breaks down at high temperatures and can release styrene, a suspected carcinogen. Definitely don’t microwave it, and avoid reusing it for food or drinks.

#7 – Other (Including PC – Polycarbonate)

This is kind of the mystery category. It includes a mix of plastics that don’t fall into the other six categories, and that often includes polycarbonate—the stuff used in many reusable water bottles and baby bottles.
Problem is, polycarbonate can release BPA (bisphenol A), especially when heated. If your bottle is labeled “7” and it’s made of a hard, clear plastic, it’s probably best not to use it for hot drinks—or better yet, switch to something safer.
Bottom Line? Check the Bottom!

Before you grab that drink or think about reusing that empty bottle, take a second to flip it over and check the number. It’s a small habit that could make a big difference for your health.
As a general rule, stick with plastics labeled “5” for reusability and steer clear of “3,” “6,” and “7” for anything involving food or drink.
Why It Matters:

At the end of the day, being a smart consumer doesn’t mean you have to memorize all the science—but knowing a few basics can help you protect your health, cut down on plastic waste, and make safer choices for your family.
So next time you’re in the grocery store or cleaning out your fridge, don’t just look at the label—check the bottom too.
It’s a simple step that can go a long way in keeping you and your loved ones safe and healthy. Plus, by making smarter choices, you’re also doing your part to reduce plastic pollution and protect the environment. Every little bit helps!

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