PETG , or Polyethylene Terephtalate Glycol modified is a synhetic thermoplastic polyester. PETG has excellent durability, great chemical resistance and at the same time brilliant formability, which allows us to manufacture lot of products from PETG and even to 3D print it.
The adhesion between the layers is very good and this is why a lot of products from trivial round can be produced – like bottles for water, cup holders and other designes. PETG is SAVE FOR KEEPING FOOD. This is why we can  use PETG for food containers, prototypes, protective equipment, dysplays, etc. 3D printing with PETG is almost easy as PLA but PETG is much stronger and has higher heat resistance.
This is why PETG is a very popular material.