Thermo Scientific* Nalgene* Wide-Mouth Square HDPE Bottles with polypropylene closures feature durable, uniform walls resistant to splitting or puncturing. Easy to grip bottles save valuable storage space. Details: ? Wide mouth for easy filling and pouring ? Square shape saves shelf space ? Durable, uniform walls are resistant to splitting or puncturing ? Leak-proof?, lineless polypropylene caps Ordering Alerts: Bottles and closures are packed in separate polybags within the same carton Compliance: Manufactured in compliance with ISO13485:2003 quality requirements. ? The term ?leak-proof? applies to Thermo Scientific Nalgene products that meet the following criteria: a) Bottle/flask/funnel closure systems with closures smaller than 100mm, after they are filled with water, inverted, withstand air pressure of 2psig for 2 minutes, and no water escapes;. b) Bottle/funnel/flask closure systems of larger than 100mm after they are filled with water, inverted for 15 minutes, and no water escapes. Note: these tests, using other liquids, may not yield the same results. To ensure safe usage, customers are advised to test Thermo Scientific Nalgene bottles and closures under conditions of their planned applications. Thermo Scientific Nalgene products are leak-proof at ambient temperature and pressure when used with their Nalgene closures.