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According to TheBottleGuide.com

What are Number 7 Plastic Bottles and their common uses?

Other #7 indicates that a container is created with a resin that is not listed or a combination of plastics. They are often used in reusable water jugs and baby bottles. A wide variety of plastic end up being lumped into number #7. Polycarbonates have received a lot of attention lately due to the controversy of BPA (Bisphenol A).