3-side seal zipper pouches are a fantastic choice when you do not need the product to sit upright on a shelf. With a more economical price point than stand up pouches, 3-side seal pouches are widely used because of their ability to be easily and quickly filled with product.
In the standard 3-side seal configuration, you load your product in the same way that it is removed, through the top. The 2 sides and bottom are pre-sealed.
Top preseal pouches are widely used because of their ability to be easily and quickly filled with product. The top of the pouch (above the zipper) is pre-sealed during the pouch manufacturing. The bottom of the bag is left open. This allows you to fill the pouch without having to contend with the zipper, or worry about inaccurate or unattractive heat seal placement at the most visible part of the pouch- the top.