These bottles are made of heavy glass and thick plastic with screw tops. I haven't had a single tear from over tightening or hard travel like the g conditions in my bag. I use them to store aliquots of fountain pen ink so I don't have to carry a full 8 ounce bottle of ink with me. They are also the right diameter and depth to make refilling a fountain pen easier without sticking your whole finger into the inkwell. Purchase history is perhaps the best indicator. Not only would I buy it again, I already have.
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