Often times, a bottle is not a product until it is filled. It can be food, drink, cosmetics, toiletries, chemicals, or even medicine. What type of product the bottle will hold has a huge impact on its design and materials!
For example, chemicals must often be bottled in special materials that do not react with the chemical. This allows the chemical to stay pure in the bottle, and prevents hazardous chemicals from being released.
Foods, especially dairy products, also need a special bottle design because they react with light and quickly spoil. Other foods can also last longer thanks to light or oxygen impermeable packaging.
Bottles filled with hot liquids must also be specially designed, as not to deform. This design can often be very different than the designs for bottles that are filled cold, and the materials must be able to withstand the increased temperature.
A thin-walled PET beverage bottle shrinks when you fill it with hot liquids.
Bottle designs can also allow for pleasing aesthetic and eye-catching marketing.