This article sounds like they are talking about storing foods in containers after they have been used for their original purposes. Keep that in mind.
Which Plastics Are Safe for Food Storage?
Some plastics can be recycled for water or food storage while others contain toxins not suitable for storage. Other containers may be difficult to disinfect, may allow evaporation or they may begin to collapse over a long period of time. However, in general, when determining which plastics can be reused, a good rule of thumb is that if the container originally stored food, it can be safely used for food again. Consider the following information.
• PET or PETE — This type of plastic, polyethylene terephthalate is listed as number 1 inside the recycling triangle diagram. PET plastic is clear, tough and has gas and moisture barrier properties. This plastic is commonly used for beverages such as soft drinks, juices and bottled water. It is also used for foods such as peanut butter, pickles and salad dressing. Keep in mind that there will always be a remaining scent in containers that originally stored food with strong odors.
• HDPE — High density polyethylene is the plastic commonly used for milk bottles, some juice containers and laundry products. It is shown as number 2 on the triangle code. These containers can be translucent or colored and are somewhat stiff and well-suited for packaging products with a short shelf life, such as milk. However, used milk jugs are not well suited as food storage containers.
While the plastic is considered food grade, milk containers are difficult to sanitize properly, and the plastic will break down over time. Chlorine bleach containers hold up somewhat better, but if water is stored in these containers, it should be used for purposes other than drinking, such as for laundry or dishes. Avoid using plastic garbage bags or plastic grocery bags made from this plastic as food storage liners.
(more in that article, so keep reading it)
Meanwhile, there are other concerns. The
SLATE website has this nice article which I will copy in part.
While plastic bottles can be melted down and made into new bottles, none of the milk containers in the United States are actually made from recycled material. That's because of safety concerns over bacterial and chemical contamination, and strict FDA guidelines for the manufacture of food packaging from such second-hand sources. When it's reclaimed, plastic from milk bottles is usually turned into toothbrushes, flower pots, and children's toys, among other things. But according to the EPA, just
28.9 percent of it ends up in the recycling bin. The rest may spend hundreds of years decomposing in a landfill.
A second kind of milk container—the gable-top carton—is made from paperboard and coated with a layer of low-density polyethylene. (Glenski note: so you can now learn that it's not just paint and paper.) Like the plastic bottle, gable-top cartons are made from virgin materials. Recycled paper isn't as strong as the stuff straight from the trees, so a recycled container capable of carrying that much milk would have to be much thicker, heavier, and more expensive.
Paperboard is made of trees, a renewable resource, which is good. And they're only 1 ounce (25 percent) heavier than plastic bottles. But the environmental positives end there. Making paper is a resource-intensive process, requiring huge amounts of water, fossil fuels, and chemical bleaches.
Given its high costs and third-place environmental finish, you might wonder why the gable-top carton is still hanging around the dairy case. It's probably because
ultraviolet light, which can penetrate clear glass bottles (PDF) and HDPE (PDF), degrades vitamins A and D and riboflavin. That's no small matter, considering
between one-third and one-half of American adults are vitamin D deficient.
(Glenski note: here's a disadvantage to glass that you probably have not thought of. Plastic prevents this better than glass.)