A reclosable laminated stand up pouch is a type of plastic bag that has a bottom gusset which allows it to stand up on the shelf. Think of all the food bags that stand up without any help in the grocery store, and you’ll get the idea. The bags are actually made up of multiple layers of different materials laminated together, each having a different property.
For instance, a bag that needs to stand up to extreme temperatures such as boil-in-the-bag packaging, would be made with several clear layers of nylon and poly coex films, whereas coffee or tea would require a bag with very low oxygen and moisture levels inside. In this case, a layer of foil is sandwiched between layers of poly film.
This differs from a standard polyethylene or polypropylene reclosable bag which is just one layer and generally gives the contents little if any protection.