it uses a vacuum effect to dispense the product without allowing air to flow back in. This helps preserve the formula and reduce oxidation, which can affect color, texture, and performance. 
The outer layer is usually acrylic. This gives a clean, premium look. The inner container helps with consistent dispensing. These bottles are commonly used in the cosmetic packaging industry for products that require stability and extended shelf life.
 
Beautiful and transparent, showing the charm of the product.
Outstanding durability & impact resistance for product safety.
Efficient water resistance & airtightness for product integrity.
Has the same beautiful appearance as glass bottles.