Multipurpose Anodized Aluminum Empty Bottle | 50 ML (Pack of 4) | Lightweight & Durable Container | Leak-Resistant Screw Cap | For Storage, Travel & Packaging Use

The bottles are of good quality. The outer cap fit tightly and it's impossible to open it without cutting the outer seal. With the inner seal cap in place, there's absolutely nothing which can leak past.However after the seal is broken without the inner cap installed, water slightly leaks through.The bottles aren't fancy, just pressed aluminium, perhaps reused, resulting in some minor imperfections.