Can Water Be Stored in the Trunk?

[VonGraham]

Excluding the additional load weight from water that may increase fuel consumption, water can indeed be stored in the trunk without posing any harm to human health. However, prolonged storage may affect its taste. Additional Information: 1. Scientific Theory: Professor Jiang Pingping from the School of Chemical and Materials Engineering at Jiangnan University stated that PET (polyethylene terephthalate) bottles for bottled water generally do not contain plasticizers due to the manufacturing process of PET. The stability of PET is determined by the degree of polymerization of the material. Typically, PET remains very safe at temperatures below 120°C. Since car interiors obviously do not reach such high temperatures, the claim that storing mineral water in the trunk produces toxic substances lacks scientific basis. 2. Precautions: The production standards for mineral water bottles are very strict. Previous experiments by experts have shown that even after prolonged boiling, the release of harmful substances like formaldehyde from these bottles is far below national standards. However, at temperatures exceeding 80°C, plastic bottles may soften, and the bottled water may oxidize, inevitably affecting its taste. Short-term storage is acceptable, but long-term storage of mineral water in the car trunk is not recommended.

[OAriel]

I think it's perfectly fine to store water in the trunk, but remember not to just toss it in a corner. I once tried keeping a whole case of bottled water there, and when the car turned, the bottles rolled around and crushed a bag of fruit. Now I've learned to use a divided storage box to secure them—even after a week in the car during 40°C summer heat, the water is still drinkable. Just be careful not to place glass bottles against metal parts. A friend of mine once had a glass bottle crack from the bumps, leaving the trunk sticky with spilled sugary liquid, which was a hassle to clean. For plastic bottles, remember to store them upright with the caps facing up to prevent leaks.

[TeaganLee]

Since having kids, I always keep two cases of water in my trunk. Here's a little tip: securing water bottles in the spare tire well with an elastic net is the most reliable method. Recently, I discovered a great product – a collapsible silicone water bucket, which saves space and can double as a temporary car wash tool. However, extra caution is needed in winter and summer. Bottled water can freeze and burst at sub-zero temperatures – once, it took me half a day to clean up the shattered ice from frozen mineral water bottles. If you're using larger water containers, be even more careful. A 10-liter water bucket can dent interior panels during emergency braking, so securing it with anti-slip mats and straps is essential for safety.

[Kent]

Veteran drivers recommend being strategic about storing water in your trunk. For short trips, carrying two bottles is fine, but for long journeys, secure a whole case with Velcro straps and lock the box. Last month during a road trip, I witnessed a rear-end collision where 24 bottled waters burst through their cardboard box in the neighboring car, with flying bottles smashing the rear windshield. Avoid placing metal canned drinks against the car body—sun exposure can overheat the cans and scorch interior leather. Always line storage boxes with a towel for cushioning and absorption. Once, a leaking coconut water bottle cap was contained solely by the towel, saving my leather seats.

[DelJosie]

Last week's camping test revealed: Consider temperature changes when storing water in the trunk. After 3 hours of exposure to 40-degree heat, plastic bottled water developed a slight odor, so I've now switched to stainless steel insulated bottles for water storage. Special reminder for EV owners: trunk temperatures can be about 8 degrees higher than gas cars during charging, increasing the risk of plasticizer leaching from mineral water bottles. When placing barrel water, place two shock-absorbing foam pads under the barrel to prevent knocking sounds while driving. P.S. Don't lay carbonated drinks flat - my friend's sparkling water bottle auto-erupted from bumps, staining her headliner fabric red.