4oz Amber PET Boston Round Bottle with 20/410 neck finish – the ideal packaging solution for pharmaceuticals, essential oils, tinctures, and specialty liquids. Our durable amber PET construction blocks harmful UV light, protecting light-sensitive formulations while maintaining product integrity. The secure 20/410 threaded opening accommodates standard caps and closures for reliable sealing. Perfect for small-batch producers, laboratories, and retailers seeking professional-grade bottles that combine functionality with cost-effectiveness. Stock your shelves with dependable amber packaging that customers trust.