Ready to Clean Amber Wide Mouth Packer Bottles manufactured by Qorpak are ideal storage of light sensitive solids. These packer bottles are often used in pharmaceutical, chemical and environmental applications. These bottles come with polypropylene caps and a friction fit .015" PTFE disc. Both cap and liner can be washed, heated or autoclaved depending upon your application. The PTFE disc is chemically inert, and will not interfere with your test results.