Water Bottles

The concern: Plastic water bottles are one of the most common sources of microplastic ingestion. Studies have found that single-use and reusable plastic bottles can shed thousands to millions of microplastic particles per litre, particularly when exposed to heat, sunlight, or repeated washing. Even bottles marketed as BPA-free are not necessarily safe — many BPA-free plastics still leach microplastic fragments, especially when filled with hot liquids or left in a warm car. Temperature is a key factor: research shows that plastic bottles stored above 30°C release microplastics at significantly higher rates than those kept cool.

Why it matters: We drink from water bottles daily — often multiple times a day. With the NHS recommending at least 6-8 glasses (roughly 1.5-2 litres) of fluid per day, your water bottle is one of the most frequently used items in your routine. This repeated, direct contact with liquids makes the bottle material one of the most important choices you can make to reduce microplastic exposure. Research from the State University of New York found an average of 325 microplastic particles per litre in bottled water. Over a year, that cumulative exposure adds up to tens of thousands of particles — making microplastic free water bottles a straightforward way to reduce your daily intake.

What to look for: Stainless steel (18/8 or 304 grade) and borosilicate glass are the safest materials for water bottles. Both are inert and cannot shed microplastics. Silicone seals and lids are generally considered safe. Avoid bottles made entirely from polypropylene or polycarbonate plastics. Pay attention to the lid and spout — even a stainless steel bottle with a plastic flip-top lid introduces some plastic contact. For travel, double-walled vacuum-insulated stainless steel bottles offer durability without compromising safety. For daily desk use, glass bottles with a protective silicone sleeve combine visibility with practicality. Whichever you choose, avoid putting hot drinks in any bottle with plastic components.