Corner seal stand-up pouch is also called corner bottom or plow (plough) bottom or folded bottom. The corner seal stand-up pouch is recommended for heavy products above 2kg and higher.
There is no seal at the bottom and the product sits flush on the bottom of the pouch. But because the product is heavier, the pouch does not need the seal to help it stand erect. So, there are only seals on the lower corners of the pouch.