Enhanced Product Protection (Before First Use): The inner seal provides a hermetic barrier, ensuring the product is completely fresh and uncontaminated until the moment the consumer opens it. This is superior to a simple open jar.
Luxury Perception and Feel: The outer shell can be made from expensive-feeling materials (frosted glass, ceramic, weighted plastic) that would be too costly or fragile to use for the entire product volume. This creates a high-end, apothecary-style unboxing experience.
Stability and Weight: The jar feels substantial, expensive, and stable on a vanity table. It doesn't tip over easily.
Refill Potential: Some high-end brands sell refill packs that are just the inner product chamber. This allows consumers to keep the beautiful outer shell and simply replace the inner insert, reducing packaging waste and often costing less than a full new jar.