There are two key aspects to choosing the right package for your product, the aesthetics and the function.

Aesthetics refers to how the package influences the overall look of your product on a self. If you are delivering a consumer product then the packaging is a key element of your overall brand strategy. If your product is high end then you want a package that demonstrates the spirit of that brand, that makes it look exclusive and worthwhile.

Function is an equally important part of your packaging decision. The package or bottle is more than a container, it is a delivery mechanism that impacts the overall customer experience. Even if the package is aesthetical and compells your customer to purchase, function is what impacts the experience. If your customer has difficulty getting the product out of the package, or it makes a mess, then you've reduced the chance that the customer is going to buy it again.

All Plastics bottles has distinctive properties that will affect how the consumer views and uses your product. For example, if you need to protect your product from mositure, or exposure to air, then certain plastics do this better than others. Also, the package affects the application, if you need a squeezable or rigid container, or how quickly your product should come out of the bottle. Below is a table that describes the various properties of different types of plastic.

Resin	Polyethylene Terephthalate (PET)	Low Density Polyethylene (LDPE)	High Density Polyethylene (HDPE)	PolyPropylene (PP)	Polystyrene (PS)	Polyvinyl Chloride (PVC)
Material Code Symbol
Clarity	Clear	Translucent	Translucent	Translucent	Clear	Clear
Moisture Barrier	Fair to Good	Good	Good to Excellent	Good to Excellent	Poor to Fair	Fair
Oxygen Barrier	Good	Poor	Poor	Poor	Fair	Good
Max Temp Resistance	120F	120F	145F	165F	150F	140F
Rigidity	Moderate to High	Low	Moderate	Moderate to High	Moderate to High	Moderate to High
Resistance to Impact	Good to Excellent	Excellent	Good to Excellent	Poor to Good	Poor to Good	Fair to Good
Resistance to Heat	Poor to Fair	Fair	Good	Good	Fair	Poor to Fair
Resistance to Cold	Good	Excellent	Excellent	Poor to Fair	Poor	Fair
Resistance to Sunlight	Good	Fair	Fair	Fair	Fair to Poor	Poor to Good

Similar to the material you use to package your product, the neck finish and cap type are important features to consider. Screw thread cap sizes are generally expressed as two numbers (ie 28/410). The first number refers to the cap diameter (in millimeters) and the corresponding Glass Packaging Institute (GPI)/Society of the Plastics Industry (SPI) finish diameter. The second number refers to the height and thread configuration of the closure or finish.