1. Protection of the Formula:
Light and Air Exposure: While not as sealed as a pump, a jar with a tight-fitting lid still offers good protection from light, which can degrade some active ingredients like Vitamin C and retinol.
Physical Protection: The sturdy walls of a jar protect the product from being crushed or damaged during shipping or handling.
2. Ease of Use and Accessibility:
Jars are simple and intuitive. There are no mechanisms to clog or break (like with a pump). Users can easily get every last bit of product out, minimizing waste. This is a significant advantage for thick, rich formulas that might not dispense well through a narrow pump.