A 1-Litre Bottle Of Water Contains Some 2,40,000 Plastic Fragments: Study Nanoplastics pose a greater threat to human health than microplastics because they're small enough to penetrate human cells, enter the bloodstream and impact organs. A typical one-liter (33-ounce) bottle of water contains some 240,000 plastic fragments on average, according to a new study. Many of those fragments have historically gone undetected, the researchers determined, suggesting that health concerns linked to plastic pollution may be dramatically underestimated. The peer-reviewed study, published Monday in the journal Proceedings of the National Academy of Sciences, is the first to evaluate bottled water for ...