The idea on which the patent is based is very simple: combining two pre-existing technologies to create a product that is not available on the market. Flat Bags are actually produced using an ordinary paper bag machine, which can work at extremely high speeds. A handle applicator especially created by Flat Bag to adapt to the speeds and the characteristics of the paper bag machine was attached to this production system. This resulted in exceptional optimisation of time and waste. In addition, this production system can also process paper of very low weight and can make extra small bellows or even produce bags without bellows.