Three-side sealed bag design—maximum capacity, minimum film usage. Through a single rear fold and double-sided sealing, a pillow-shaped cavity is formed, which can hold 20% more material than a four-side sealed bag of the same size. The ultra-thin barrier layer blocks oxygen and ultraviolet rays to ensure shelf life. The flat bag structure significantly reduces transportation costs. From 1-gram spice packets to 50-milliliter energy gels, three-side sealed bags transform small packaging into a profit growth opportunity.