Your car is more than just a mode of transportation – it’s a mobile storage unit, a temporary shelter, and sometimes even a dining room on wheels. But beware: this versatile space can quickly transform into a danger zone if you’re not careful about what you leave inside. From melting makeup to explosive aerosols, the items you casually toss in your vehicle could be putting you at risk. Let’s dive into the eight things you should never, ever keep in your car.
1. Medications: Don’t Let the Heat Mess with Your Health
Think your glove compartment is a safe spot for your pills? Think again. Extreme temperatures and humidity changes inside your vehicle can wreak havoc on your medications, rendering them ineffective or even dangerous. Imagine popping a pill that’s been baking in your car all day – it’s like playing Russian roulette with your health. Always keep your meds at room temperature, even if it means carrying a small cooler during your commute.
But it’s not just about effectiveness. Some medications can actually become toxic when exposed to heat. That innocent-looking pill bottle could be harboring a chemical cocktail that’s anything but healthy. So, next time you’re tempted to leave your prescription in the car “just for a quick errand,” remember: your health is worth the extra effort of bringing it with you.
2. Electronics: Your Car Is Not a Tech Vault

In our tech-obsessed world, it’s tempting to treat your car like a mobile office. But leaving your laptop, phone, or tablet in your vehicle is like rolling out a welcome mat for thieves. Even if you think you’ve hidden them well, professional crooks know all the usual hiding spots. Encrypt your data for added protection, but better yet, take your gadgets with you.
Beyond the risk of theft, extreme temperatures can turn your pricey electronics into expensive paperweights. Heat can cause batteries to expand, potentially leading to dangerous situations. And cold? It can crack screens and damage internal components. Your car’s interior can reach temperatures well over 100°F on a sunny day, turning it into an oven that slowly cooks your beloved devices. Is checking your email really worth frying your laptop?
3. Sunscreen and Cosmetics: Beauty Meltdown Alert
Ladies (and beauty-conscious gents), listen up! Your car is not an extension of your bathroom vanity. Sunscreen left in a hot car can have its effectiveness diminished, leaving you vulnerable to harmful UV rays. But that’s not all – the heat can cause the active ingredients to break down, potentially leading to a sunscreen explosion. Imagine explaining that mess to your car detailer!
And let’s talk about your makeup stash. That expensive lipstick you love? It could become a gooey mess faster than you can say “touch-up.” Heat can alter the consistency and effectiveness of your cosmetics, turning your car into a beauty product graveyard. Plus, who wants to apply mascara that’s been baking in 120-degree heat? Your skin deserves better than that. Keep your beauty arsenal at home or in your bag, where it belongs.
4. Water Bottles: Hydration or Health Hazard?

Staying hydrated is important, but that innocent water bottle left in your car could be doing more harm than good. Plastic bottles can leach harmful chemicals like BPA and phthalates into your water when exposed to high heat. It’s like brewing a toxic tea right in your cup holder. And before you reach for that metal water bottle, remember that it can turn into a scalding hazard on hot days.
But the dangers don’t stop there. In freezing temperatures, that forgotten water bottle can turn into an icy projectile. As water expands when it freezes, it can cause the bottle to burst, potentially damaging your car’s interior or even causing injury if you’re in the vehicle when it happens. The solution? Bring a fresh bottle of water with you each trip, or invest in a high-quality, temperature-resistant bottle that you always take inside with you.
5. Important Documents: Don’t Hand Over Your Identity
Your car is not a filing cabinet on wheels. Leaving important documents like your passport, social security card, or bank statements in your vehicle is practically gift-wrapping your identity for thieves. These personal documents are easy targets for identity thieves who can use them to wreak havoc on your life. Even seemingly innocuous papers like school transcripts or medical records can be goldmines for determined criminals.
But it’s not just about theft. Important documents can be damaged by extreme temperatures and humidity in your car. Imagine trying to board a flight with a passport that’s been warped by heat or explain to the DMV why your birth certificate looks like it went through the wash. Keep these crucial papers in a secure location at home, or if you must travel with them, keep them on your person at all times. Your future self will thank you when you’re not spending hours on the phone with credit agencies and government offices.
6. Aerosol Cans: The Ticking Time Bombs in Your Trunk

That innocent can of hairspray or deodorant in your car? It’s a potential explosion waiting to happen. Aerosol cans have warnings against storing them in temperatures above 120 degrees Fahrenheit for a reason. The heat inside a parked car can easily surpass this threshold, causing the pressure inside the can to build up dangerously. Suddenly, your emergency touch-up kit becomes a hazardous projectile.
But it’s not just about the risk of explosion. Even if the can doesn’t burst, the heat can alter the chemical composition of what’s inside. That means your dry shampoo might not be so dry anymore, and your air freshener could end up leaving a not-so-fresh scent in your car. Play it safe and keep aerosol products out of your vehicle. If you need them on the go, opt for non-aerosol alternatives or small, travel-sized versions that you can carry in your bag.
7. Perishable Food: Your Car Is Not a Refrigerator
We’ve all done it – left that takeout container or grocery bag in the car “just for a little while.” But perishable food should not be left in your car for more than an hour, especially in hot weather. Your vehicle can quickly turn into a breeding ground for bacteria, transforming your forgotten lunch into a science experiment gone wrong. And let’s not even talk about the smell that can permeate your car’s interior, lingering long after the offending item has been removed.
It’s not just about food safety, either. Canned goods and bottled beverages can explode in extreme heat, leaving you with a sticky, potentially dangerous mess to clean up. And in cold weather? Cans and bottles can freeze and burst, creating a similar disaster. If you must transport perishables, use an insulated cooler and remove it from your car as soon as possible. Your stomach (and your nose) will thank you.
8. Lighters and Matches: Playing with Fire (Literally)
That spare lighter or box of matches in your glove compartment might seem harmless, but they’re literally playing with fire. Lighters are made of flammable materials that can expand and potentially burst when exposed to intense heat, turning your car into a potential inferno. And matches? They can ignite spontaneously in high temperatures, giving a whole new meaning to the phrase “hot wheels.”
But it’s not just about the risk of fire. In colder temperatures, lighters can crack and leak flammable fluid, creating a hazardous situation and potentially damaging your car’s interior. If you’re a smoker or need these items for other reasons, carry them on your person instead of leaving them in the car. It’s a small change that could prevent a big disaster. Remember, when it comes to fire safety, it’s always better to be overly cautious than to learn the hard way.