First introduced in the mid-1920s, valve bags have traditionally had a slightly higher cost than open-mouth bags. They also have had a reputation for being messy and failing to provide reliable seals, leading to growth in the popularity of open-mouth bags.
However, the cost difference between the two has practically disappeared. And advancements in valve bags and valve bag packaging machine technology have created cost-savings for manufacturers in the form of decreased cleaning, more accurate filling and dosing, more secure seals, more efficient palletizing and storage, and increased packaging speeds.