Reusing a plastic bag is probably best
From: https://informationisbeautiful.net/beautifulnews/1261-plastic-bag-alternatives/
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Plastic symbols
Here are the seven standard classifications for plastics, and the recycling and reuse information for each type. #1 - PET (Polyethylene Terephthalate) PET is one of the most commonly used plastics in consumer products, and is found in most water and pop bottles, and some packaging . It is intended for single use applications; repeated use increases the risk of leaching and bacterial growth. PET plastic is difficult to decontaminate, and proper cleaning requires harmful chemicals. Polyethylene terephthalates may leach carcinogens. PET plastic is recyclable and about 25% of PET bottles in the US today are recycled. The plastic is crushed and then shredded into small flakes which are then reprocessed to make new PET bottles, or spun into polyester fiber. This recycled fiber is used to make textiles such as fleece garments, carpets, stuffing for pillows and life jackets, and similar products . Products made of #1 (PET) plastic should be recycled but not reus...
Chinese ban single-use plastics
The Chinese government have released a ban on single-use plastics that goes further than any other country has done. It includes bans on the manufacture of plastic film at certain thicknesses. The full document has been translated to English here: https://www.core77.com/posts/92812/The-Complete-Translated-Text-of-Chinas-Incredible-Single-Use-Plastics-Ban