The opening of most packaging bags is either of upper opening or lower opening, while the company has, working in conjunction with the R & D of our US client, completed upper-opening and lower-opening bag. At the lower opening, one can put product, while at the upper opening you can put in paper-card or coin. The advantages are: (1) one can effectively control the bar code or serial number of the newly-developed product, and avoid difficulty of printing with too small amount; (2) insertion of PP version or hanging-card helps to strengthen its intensity for heavy-weight packaging, and enhanced plastic can be used so that packaged content won¡¦t be torn open by non-buyer.