(2) Classify them according to their colour and lustre: colorless transparent bottle, white bottle, brown bottle, green bottle and blue bottle, etc.
(3) According to the shape of bottleneck, there are neck bottles, non-neck bottles, long neck bottles, short neck bottles, thick neck bottles and thin neck bottles.
(4) Classification according to the size of bottle mouth
1. Small-mouth bottles. It is a glass bottle with a diameter less than 20 mm. It is mostly used for packing liquid materials, such as soda, beer, etc.
2. Big mouth bottle. A glass bottle with a diameter between 20 and 30 mm is thicker and shorter, such as a milk bottle.
3. Bottles with wide mouth. Also known as canned bottle, the inner diameter of the bottle is more than 30 mm, its neck and shoulder are shorter, the shoulder of the bottle is flat, mostly in the shape of a can or cup. Because of the large mouth of the bottle, the loading and discharging are easy. It is mostly used for packaging canned food and viscous materials.
