Insulated
An attractive and affordable insulated bottle with a glossy finish, featuring a high-quality plastic cap and a flip-up straw. It's a popular budget-friendly option.
How scores are calculated
Materials (40%): How plastic-free the product is — raw materials, construction, and coatings.
Packaging (20%): Is the product packaged in plastic? Is it recyclable?
Transparency (20%): Does the brand disclose ingredients, sourcing, and manufacturing?
Durability (20%): How long does it last? Longer-lasting products reduce plastic waste over time.
This is a rating of this specific product only — not the company. Other products from this brand may score differently.
Last updated: April 4, 2026
Good value and aesthetic, but the plastic straw can impart flavor and insulation is mediocre. Not dishwasher safe.
Why We Rated It This Way
Iron Flask's Insulated is made from 18/8 Stainless steel body, high-quality plastic cap, silicone straw.
Chemical & Health Analysis
Each chemical of concern is broken down below — what it is, where it comes from in this product, what it does to the body, and who is most at risk.
Various plastic chemicals
Iron Flask Insulated
Plastic flavoring from the straw, especially when exposed to heat.
All health claims are based on published, peer-reviewed research from the NIH, WHO, IARC, and peer-reviewed journals. This information is for educational purposes and does not constitute medical advice.
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